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| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 400998 |
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| IRS990/ActivityOrMissionDesc | 0 | THE CALHOUN SCHOOL IS A PROGRESSIVE, INDEPENDENT, COEDUCATIONAL COLLEGE PREPARATORY SCHOOL WITH STUDENTS RANGING FROM THREE-YEAR-OLDS TO TWELFTH GRADERS. |
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| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
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| IRS990/BooksInCareOfDetail/PersonNm | 0 | BRENDAN DOYLE DIR OF FINANC |
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| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | new york |
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| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 144-15 70th AVENUE |
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| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | FLUSHING |
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| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 11367 |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 0 | EMERALD SERVICES INC |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 1 | TRANS AMERICA TRANSPORT INC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | MAINTENANCE |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | TRANSPORTATION |
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| IRS990/CYTotalExpensesAmt | 0 | 36675549 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 1007195 |
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| IRS990/Desc | 0 | CALHOUN'S GOAL IS TO INSPIRE A PASSION FOR LEARNING THROUGH A PROGRESSIVE APPROACH TO EDUCATION THAT VALUES INTELLECTUAL PURSUIT, CREATIVITY, DIVERSITY, AND COMMUNITY INVOLVEMENT. |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 2.0 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 2.0 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 26 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 27 | 40.0 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 30 | 40.0 |
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| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 15 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 16 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 18 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 19 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 20 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 21 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 22 | X |
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| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | David Elsberg |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Louise Gore |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Karen Greene |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | Terry Haas |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | Aasem Khalil |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | Jason McIntosh |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | Colleen Pike Blair |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | Barbara Pyles |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | Shaiza Rizavi |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | Steven Sinatra |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | Claudia Singleton |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 24 | Brendan Doyle |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 25 | Lorenzo Krakowsky |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 26 | Allison Rothschild |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 27 | Jonathan Haff |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 28 | Daniel Isquith |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 29 | Lisa Bianchi Merritt |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 30 | David Alpert |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 31 | ANDREW HUME |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 32 | Steven Nelson |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 24 | 210458 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 25 | 190583 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 26 | 190851 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 27 | 177320 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 28 | 147938 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 30 | 144749 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 31 | 173837 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 32 | 722752 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 24 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 25 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 26 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 27 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 28 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 29 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 30 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 31 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 32 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Vice Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | Head of School |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | Director of Finance |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | Director of Upper School |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 26 | Director of Lower School |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 27 | Director of Technology |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 28 | Director of Middle School |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 29 | Director of College Counseling |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 30 | Director of Performing Arts |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 31 | DIRECTOR OF ENROLLMENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 32 | Head of School Through 6/2017 |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/Form990TFiledInd | 0 | true |
| IRS990/FormationYr | 0 | 1941 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | true |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | true |
| IRS990/FundraisingAmt | 0 | 1032485 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 151789 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 151789 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 196974 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GamingDirectExpensesAmt | 0 | 0 |
| IRS990/GamingGrossIncomeAmt | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 23 |
| IRS990/GovernmentGrantsAmt | 0 | 341025 |
| IRS990/GrantAmt | 0 | 5280033 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 0 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 0 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 5280033 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 5280033 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | true |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |