Liabilities / Assets
48th percentile
Higher debt load relative to assets than 48% of similar nonprofits.
EIN 36-4052298 • 501(c)9 • Elmhurst, IL
Profile
TO FUND HEALTH INSURANCE OBLIGATIONS OF McMASTER-CARR SUPPLY CO.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
48th percentile
Higher debt load relative to assets than 48% of similar nonprofits.
Liabilities / Revenue
49th percentile
Higher debt load relative to revenue than 49% of similar nonprofits.
Net Margin
80th percentile
Higher net margin than 80% of similar nonprofits.
Top Officer Pay
38th percentile
Higher top officer pay than 38% of similar nonprofits.
Top officer pay equals 0.0% of source-year revenue.
Asset Growth
83rd percentile
Faster asset growth than 83% of similar nonprofits.
Revenue Growth
62nd percentile
Faster revenue growth than 62% of similar nonprofits.
Assets
Up$531,426,909
Up $66,717,753 (+14%) from 2023
Liabilities
Down$5,989,425
Down $420,042 (-6.6%) from 2023
Net Assets
Up$525,437,484
Up $67,137,795 (+15%) from 2023
Revenue
Up$157,521,141
Up $17,658,455 (+13%) from 2023
Expenses
Up$115,662,466
Up $7,589,253 (+7.0%) from 2023
Net Income
Up$41,858,675
Up $10,069,202 (+32%) from 2023
Most recent year
2024 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
TO FUND HEALTH INSURANCE OBLIGATIONS OF McMASTER-CARR SUPPLY CO.
TO PROVIDE HEALTH INSURANCE, TERM LIFE INSURANCE AND LONG TERM DISABILITY BENEFITS TO ELIGIBLE EMPLOYEES AND RETIREES OF McMASTER-CARR SUPPLY COMPANY
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments in Publicly Traded Securities | $460,818,789 | $526,688,076 | ▲ $65,869,287 |
| Rtn Earn Endowment Incm Other Fnds | $458,299,689 | $525,437,484 | ▲ $67,137,795 |
| Savings and Temporary Cash Investments | $2,403,889 | $3,155,465 | ▲ $751,576 |
| Accounts Receivable | $273,546 | $685,878 | ▲ $412,332 |
| Prepaid Expenses and Deferred Charges | $755,805 | $424,082 | ▼ $331,723 |
| Total Assets | $464,709,156 | $531,426,909 | ▲ $66,717,753 |
| Other Assets Total | $457,127 | $473,408 | ▲ $16,281 |
| Liabilities | |||
| Other Liabilities | $3,817,739 | $4,879,466 | ▲ $1,061,727 |
| Accounts Payable and Accrued Expenses | $2,591,728 | $1,109,959 | ▼ $1,481,769 |
| Total Liabilities | $6,409,467 | $5,989,425 | ▼ $420,042 |
| Net Assets / Fund Balance | |||
| Total Net Assets Fund Balance | $458,299,689 | $525,437,484 | ▲ $67,137,795 |
| Total Liabilities and Net Assets / Fund Balance | $464,709,156 | $531,426,909 | ▲ $66,717,753 |
| Name | Title |
|---|---|
| J a Delaney | Trustee |
| Jack Delaney | Trustee |
| R O Delaney Jr | Trustee |
| S Epstein | Trustee |
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| United Healthcare | Third-Party Healthcare Administrator | 2310 Parklake Dr NE, Atlanta, GA 30345 | $3,236,014 |
| Express Script | Pharmacy Benefit Management | One Express Way, Saint Louis, MO 63121 | $954,651 |
| Spring Health | Mental Healthcare and Wellbeing Support | 60 Madison Ave Floor 2, New York, NY 10010 | $513,369 |
| Mercer | Consulting Services | 155 North Wacker Drive Suite 1500, Chicago, IL 60606 | $279,977 |
| Delta Dental | Dental Claims Administrator | 1515 W 22nd St Suite 450, Oak Brook, IL 60523 | $187,882 |
| Line Item | Amount |
|---|---|
| Other Expenses | $20,710,022 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Salaries, Compensation, and Employee Benefits | $0 |
| Total Fundraising Expense | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Benefits to Members | $94,952,444 | - | - | $94,952,444 |
| Other Expenses | $5,440,295 | $15,269,727 | - | $15,269,727 |
| Total Functional Expenses | $100,392,739 | $15,269,727 | $0 | $115,662,466 |
| Line Item | Amount |
|---|---|
| Expenses per Audited Statements | $115,662,466 |
| Total Expenses per Audited Statements | $115,662,466 |
| Total Expenses per Form 990 | $115,662,466 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Liability | Amount |
|---|---|
| State income taxes | $3,427,806 |
| Federal income taxes | $1,451,660 |
“J.A. DELANEY, R.O. DELANEY, JR., AND JACK DELANEY ARE RELATED. ALL FOUR TRUSTEES ARE OFFICERS OF THE PLAN SPONSOR, McMASTER-CARR SUPPLY COMPANY.”
“The trustees have delegated the payment of medical, dental, vision and pharmaceutical claims to a third party administrator. Payment of these types of claims by a third party administrator is appropriate given the nature and privacy of medical claims.”
“The trustees meet with the independent investment manager not less than three times a year to review the investment results of the trust. Employees of the plan sponsor, under the direction of one of the trustees, meet with benefit consultants to ensure that the third party administrators are complying with plan documents.”
“Form 990 is reviewed by pricewaterhousecoopers llp, the external auditor prior to filing. The return preparer shares a copy of form 990 with each trustee via email before filing.”
“The plan sponsor is a privately held corporation. The trust does not make its governing documents or its conflict of interest policy available to the public. The trusts financial statements are available to the public via this form 990 and the plan sponsors form 5500.”
“Accounting principles generally accepted in the United States of America require plan management to evaluate tax positions taken by the Plan and recognize a tax liability or asset if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. There are no uncertain positions taken or expected to be taken that would require recognition of a liability or disclosure in the financial statements as of December 31, 2024 and 2023.The Plan is subject to routine audits by taxing jurisdictions however, there are currently no audits for any tax periods in progress. The Plan administrator believes it is no longer subject to income tax examinations for years prior to 2021.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 2591728 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 1109959 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 273546 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 685878 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | TO PROVIDE HEALTH INSURANCE, TERM LIFE INSURANCE AND LONG TERM DISABILITY BENEFITS TO ELIGIBLE EMPLOYEES AND RETIREES OF McMASTER-CARR SUPPLY COMPANY |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 0 |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BenefitsToMembersGrp/ProgramServicesAmt | 0 | 94952444 |
| IRS990/BenefitsToMembersGrp/TotalAmt | 0 | 94952444 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | SETH EPSTEIN |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6307823872 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 600 COUNTY LINE ROAD |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | ELMHURST |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 60126 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 6 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 0 |
| IRS990/CompDisqualPersonsGrp/TotalAmt | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | false |
| IRS990/CompensationProcessOtherInd | 0 | false |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | false |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 3236014 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 954651 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 513369 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 3 | 279977 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 4 | 187882 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 2310 Parklake Dr NE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | One Express Way |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 2 | 60 Madison Ave Floor 2 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 3 | 155 North Wacker Drive Suite 1500 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 4 | 1515 W 22nd St Suite 450 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | Atlanta |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | Saint Louis |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 2 | New York |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 3 | Chicago |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 4 | Oak Brook |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | GA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | MO |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 2 | NY |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 3 | IL |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 4 | IL |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 30345 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 63121 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 2 | 10010 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 3 | 60606 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 4 | 60523 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | United Healthcare |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | Express Script |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 2 | Spring Health |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 3 | Mercer |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 4 | Delta Dental |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | Third-Party Healthcare Administrator |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | Pharmacy Benefit Management |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | Mental Healthcare and Wellbeing Support |
| IRS990/ContractorCompensationGrp/ServicesDesc | 3 | Consulting Services |
| IRS990/ContractorCompensationGrp/ServicesDesc | 4 | Dental Claims Administrator |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 94952444 |
| IRS990/CYContributionsGrantsAmt | 0 | 0 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 57128402 |
| IRS990/CYOtherExpensesAmt | 0 | 20710022 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 100392739 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 41858675 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/CYTotalExpensesAmt | 0 | 115662466 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 157521141 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DelegationOfMgmtDutiesInd | 0 | true |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 0 |
| IRS990/Desc | 0 | TO FUND HEALTH INSURANCE OBLIGATIONS OF McMASTER-CARR SUPPLY CO. |
| IRS990/DescribedInSection501c3Ind | 0 | false |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | false |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 100392739 |
| IRS990/FamilyOrBusinessRlnInd | 0 | true |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesLobbyingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignGrantsGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 040.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 040.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 040.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 040.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 000.01 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 000.01 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 000.01 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 000.01 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | J A DELANEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | R O DELANEY JR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | S EPSTEIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | JACK DELANEY |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TRUSTEE |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/Form990TFiledInd | 0 | true |
| IRS990/FormationYr | 0 | 1995 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 45754582 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 4 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 161999973 |
| IRS990/GrossReceiptsAmt | 0 | 273766532 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 0 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 0 |
| IRS990/InterestGrp/TotalAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 11373820 |
| IRS990/InvestmentIncomeGrp/UnrelatedBusinessRevenueAmt | 0 | 11373820 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 460818789 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 526688076 |
| IRS990/IRPDocumentCnt | 0 | 0 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LegalDomicileStateCd | 0 | IL |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 116245391 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | TO FUND HEALTH INSURANCE OBLIGATIONS OF McMASTER-CARR SUPPLY CO. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 458299689 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 525437484 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 45754582 |
| IRS990/NetGainOrLossInvestmentsGrp/UnrelatedBusinessRevenueAmt | 0 | 45754582 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 53699497 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 25279120 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/TotalAmt | 0 | 0 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 0 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501cInd | 0 | X |
| IRS990/OrgDoesNotFollowFASB117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 457127 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 473408 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/Desc | 0 | THIRD PARTY ADMINISTRATION FEE |
| IRS990/OtherExpensesGrp/Desc | 1 | UNRELATED BUSINESS INCOME TAX |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 15269727 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 5440295 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 5440295 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 15269727 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 3817739 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 4879466 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 0 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PaymentsToAffiliatesGrp/TotalAmt | 0 | 0 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 0 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 755805 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 424082 |
| IRS990/PrincipalOfficerNm | 0 | SETH EPSTEIN |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | BENEFITS |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | PHARMACY REBATES |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 90222237 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 10170502 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 90222237 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 10170502 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 91452108 |
| IRS990/PYInvestmentIncomeAmt | 0 | 43549412 |
| IRS990/PymtTravelEntrtnmntPubOfclGrp/TotalAmt | 0 | 0 |
| IRS990/PYOtherExpensesAmt | 0 | 16621105 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 96313274 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 31789473 |
| IRS990/PYTotalExpensesAmt | 0 | 108073213 |
| IRS990/PYTotalRevenueAmt | 0 | 139862686 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 41858675 |
| IRS990/RelatedEntityInd | 0 | true |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | false |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | true |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 100392739 |
| IRS990/RoyaltiesGrp/TotalAmt | 0 | 0 |
| IRS990/RtnEarnEndowmentIncmOthFndsGrp/BOYAmt | 0 | 458299689 |
| IRS990/RtnEarnEndowmentIncmOthFndsGrp/EOYAmt | 0 | 525437484 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 2403889 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 3155465 |
| IRS990/ScheduleBRequiredInd | 0 | false |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 115662466 |
| IRS990ScheduleD/FederalIncomeTaxLiabilityAmt | 0 | 1451660 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/InclEscrowCustodialAcctLiabInd | 0 | false |
| IRS990ScheduleD/NetUnrealizedGainsInvstAmt | 0 | 25279120 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 1451660 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 1 | 3427806 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | Federal income taxes |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 1 | State income taxes |
| IRS990ScheduleD/OtherSecuritiesGrp/Desc | 0 | Financial derivatives and other financial products |
| IRS990ScheduleD/OtherSecuritiesGrp/Desc | 1 | Closely-held equity interests |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | 25279120 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 157521141 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | Accounting principles generally accepted in the United States of America require plan management to evaluate tax positions taken by the Plan and recognize a tax liability or asset if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. There are no uncertain positions taken or expected to be taken that would require recognition of a liability or disclosure in the financial statements as of December 31, 2024 and 2023.The Plan is subject to routine audits by taxing jurisdictions however, there are currently no audits for any tax periods in progress. The Plan administrator believes it is no longer subject to income tax examinations for years prior to 2021. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | X 2 |
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| IRS990ScheduleD/TotalLiabilityAmt | 0 | 4879466 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 157521141 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 182800261 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 115662466 |
| IRS990/ScheduleJRequiredInd | 0 | false |
| IRS990/ScheduleORequiredInd | 0 | true |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | J.A. DELANEY, R.O. DELANEY, JR., AND JACK DELANEY ARE RELATED. ALL FOUR TRUSTEES ARE OFFICERS OF THE PLAN SPONSOR, McMASTER-CARR SUPPLY COMPANY. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | THE TRUSTEES HAVE DELEGATED THE PAYMENT OF MEDICAL, DENTAL, VISION AND PHARMACEUTICAL CLAIMS TO A THIRD PARTY ADMINISTRATOR. PAYMENT OF THESE TYPES OF CLAIMS BY A THIRD PARTY ADMINISTRATOR IS APPROPRIATE GIVEN THE NATURE AND PRIVACY OF MEDICAL CLAIMS. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | THE TRUSTEES MEET WITH THE INDEPENDENT INVESTMENT MANAGER NOT LESS THAN THREE TIMES A YEAR TO REVIEW THE INVESTMENT RESULTS OF THE TRUST. EMPLOYEES OF THE PLAN SPONSOR, UNDER THE DIRECTION OF ONE OF THE TRUSTEES, MEET WITH BENEFIT CONSULTANTS TO ENSURE THAT THE THIRD PARTY ADMINISTRATORS ARE COMPLYING WITH PLAN DOCUMENTS. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | FORM 990 IS REVIEWED BY PRICEWATERHOUSECOOPERS LLP, THE EXTERNAL AUDITOR PRIOR TO FILING. THE RETURN PREPARER SHARES A COPY OF FORM 990 WITH EACH TRUSTEE VIA EMAIL BEFORE FILING. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 4 | THE PLAN SPONSOR IS A PRIVATELY HELD CORPORATION. THE TRUST DOES NOT MAKE ITS GOVERNING DOCUMENTS OR ITS CONFLICT OF INTEREST POLICY AVAILABLE TO THE PUBLIC. THE TRUSTS FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC VIA THIS FORM 990 AND THE PLAN SPONSORS FORM 5500. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Form 990, Part VI, Section A, Line 2 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Form 990, Part VI, Section A, Line 3 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Form 990, Part VI, Section A, Line 8 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Form 990, Part VI, Section B, Line 11B |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 4 | Form 990, Part VI, Section C, Line 19 |
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| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/EIN | 0 | 361458720 |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/EntityTypeTxt | 0 | C Corp |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/LegalDomicileStateCd | 0 | IL |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/PrimaryActivitiesTxt | 0 | DISTRIBUTION |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/RelatedOrganizationName/BusinessNameLine1Txt | 0 | McMASTER-CARR SUPPLY CO |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/USAddress/AddressLine1Txt | 0 | 600 COUNTY LINE ROAD |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/USAddress/CityNm | 0 | ELMHURST |
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| IRS990/SubjectToProxyTaxInd | 0 | false |
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| IRS990/TaxablePartyNotificationInd | 0 | false |
| IRS990/TaxExemptBondsInd | 0 | false |
| IRS990/TerminateOperationsInd | 0 | false |
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| IRS990/TotalAssetsEOYAmt | 0 | 531426909 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 464709156 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 531426909 |
| IRS990/TotalCompGreaterThan150KInd | 0 | false |
| IRS990/TotalEmployeeCnt | 0 | 0 |
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| IRS990/TotalFunctionalExpensesGrp/ProgramServicesAmt | 0 | 100392739 |
| IRS990/TotalFunctionalExpensesGrp/TotalAmt | 0 | 115662466 |
| IRS990/TotalGrossUBIAmt | 0 | 57128402 |
| IRS990/TotalLiabilitiesBOYAmt | 0 | 6409467 |
| IRS990/TotalLiabilitiesEOYAmt | 0 | 5989425 |
| IRS990/TotalLiabilitiesGrp/BOYAmt | 0 | 6409467 |
| IRS990/TotalLiabilitiesGrp/EOYAmt | 0 | 5989425 |
| IRS990/TotalNetAssetsFundBalanceGrp/BOYAmt | 0 | 458299689 |
| IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt | 0 | 525437484 |
| IRS990/TotalProgramServiceExpensesAmt | 0 | 100392739 |
| IRS990/TotalProgramServiceRevenueAmt | 0 | 100392739 |
| IRS990/TotalRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 100392739 |
| IRS990/TotalRevenueGrp/TotalRevenueColumnAmt | 0 | 157521141 |
| IRS990/TotalRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 57128402 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/BOYAmt | 0 | 464709156 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/EOYAmt | 0 | 531426909 |
| IRS990/TravelGrp/TotalAmt | 0 | 0 |
| IRS990/TypeOfOrganizationTrustInd | 0 | X |
| IRS990/UnrelatedBusIncmOverLimitInd | 0 | true |
| IRS990/UponRequestInd | 0 | X |
| IRS990/USAddress/AddressLine1Txt | 0 | 600 COUNTY LINE ROAD |
| IRS990/USAddress/CityNm | 0 | ELMHURST |
| IRS990/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/USAddress/ZIPCd | 0 | 60126 |
| IRS990/VotingMembersGoverningBodyCnt | 0 | 4 |
| IRS990/VotingMembersIndependentCnt | 0 | 0 |
| IRS990/WhistleblowerPolicyInd | 0 | false |
| ReturnHeader/BuildTS | 0 | 2025-03-06 01:10:19Z |
| ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd | 0 | false |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | SETH EPSTEIN |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | TRUSTEE |
| ReturnHeader/BusinessOfficerGrp/PhoneNum | 0 | 6307823872 |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2025-10-23 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | McMASTER-CARR SUPPLY CO EMPLOYEES' WELFARE TRUST |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | MCMA |
| ReturnHeader/Filer/EIN | 0 | 364052298 |
| ReturnHeader/Filer/PhoneNum | 0 | 6307823872 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | PO BOX 680 |
| ReturnHeader/Filer/USAddress/CityNm | 0 | ELMHURST |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | IL |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 60126 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmEIN | 0 | 920460586 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt | 0 | PwC US Tax LLP |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt | 0 | ONE NORTH WACKER DRIVE |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm | 0 | CHICAGO |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd | 0 | IL |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd | 0 | 60606 |
| ReturnHeader/PreparerPersonGrp/PhoneNum | 0 | 3122982000 |
| ReturnHeader/PreparerPersonGrp/PreparationDt | 0 | 2025-10-23 |
| ReturnHeader/PreparerPersonGrp/PreparerPersonNm | 0 | NOLAN OGDEN |
| ReturnHeader/ReturnTs | 0 | 2025-10-30T03:54:24-00:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990 |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2024-01-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2024-12-31 |
| ReturnHeader/TaxYr | 0 | 2024 |
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