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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 174634 |
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| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 19025 |
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| IRS990/ActivityOrMissionDesc | 0 | TO PRESENT, PROMOTE, AND PROVIDE EDUCATION IN CONTEMPORARY MUSIC AND RELATED FIELDS. THE BOSTON MODERN ORCHESTRA PROJECT IS WIDELY RECOGNIZED AS THE LEADING ORCHESTRA IN THE UNITED STATES DEDICATED EXCLUSIVELY TO PERFORMING NEW MUSIC, AND ITS SIGNATURE RECORD LABEL, BMOP/SOUND, IS THE NATION'S FOREMOST LABEL LAUNCHED BY AN ORCHESTRA AND SOLELY DEVOTED TO NEW MUSIC RECORDINGS. BMOP AFFIRMS ITS MISSION TO ILLUMINATE THE CONNECTIONS THAT EXIST NATURALLY BETWEEN CONTEMPORARY MUSIC AND CONTEMPORARY SOCIETY BY REUNITING COMPOSERS AND AUDIENCES IN A SHARED CONCERT EXPERIENCE. |
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| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 6995 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 13116 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 21860 |
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| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 20250 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 45169 |
| IRS990/AmendedReturnInd | 0 | X |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BackupWthldComplianceInd | 0 | 1 |
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| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 376 WASHINGTON STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | MALDEN |
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| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02148 |
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| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
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| IRS990/ConservationEasementsInd | 0 | 0 |
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| IRS990/CreditCounselingInd | 0 | 0 |
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| IRS990/CYTotalRevenueAmt | 0 | 1187386 |
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| IRS990/Desc | 0 | THE BOSTON MODERN ORCHESTRA PROJECT PROVIDES ACCESS TO A FULL SCHEDULE OF CONCERTS AND PROVIDES SERVICES AND MATERIALS THAT OTHERWISE WOULD NOT BE AVAILABLE TO THE GENERAL PUBLIC. IN ITS FIRST TWENTY THREE SEASONS, BMOP ESTABLISHED A TRACK RECORD THAT INCLUDES MORE THAN 100 PERFORMANCES, OVER 70 WORLD PREMIERES (INCLUDING 30 COMMISSIONED WORKS), TWO OPERA UNLIMITED FESTIVALS WITH OPERA BOSTON, THE INAUGURAL DITSON FESTIVAL OF CONTEMPORARY MUSIC WITH THE ICA/BOSTON, AND OVER 70 COMMERCIAL RECORDINGS, INCLUDING 58 CDS FROM BMOP/SOUND.IN BOSTON, BMOP PERFORMS AT BOSTON'S JORDAN HALL AND SYMPHONY HALL, AND THE ORCHESTRA HAS ALSO PERFORMED IN NEW YORK AT MILLER THEATER, THE WINTER GARDEN, WEILL RECITAL HALL AT CARNEGIE HALL, AND THE LYCEUM IN BROOKLYN. A PERENNIAL WINNER OF THE ASCAP AWARD FOR ADVENTUROUS PROGRAMMING OF ORCHESTRAL MUSIC AND 2006 WINNER OF THE JOHN S. EDWARDS AWARD FOR STRONGEST COMMITMENT TO NEW AMERICAN MUSIC, BMOP HAS APPEARED AT THE BANK OF AMERICA CELEBRITY SERIES (BOSTON, MA), TANGLEWOOD, THE BOSTON CYBERARTS FESTIVAL, THE FESTIVAL OF NEW AMERICAN MUSIC (SACRAMENTO, CA), AND MUSIC ON THE EDGE (PITTSBURGH, PA). |
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| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 24560 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
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| 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 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
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| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | JAMES BARNETT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | STEPHANIE BOYE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | DAVID LOYD BROWN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | ANURADHV YADAV |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | HARRIET ECKSTEIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | WALTER B HOWELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | RAYFORD LAW |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | SAM A MAWN-MAHLA |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | PRESIDENT |
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| IRS990/GrossRentsGrp/RealAmt | 0 | 500 |
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| IRS990/MissionDesc | 0 | TO BUILD A STRUCTURALLY SOUND AND MUSICALLY VITAL ENSEMBLE WHICH SEEKS TO EXPLOTE AND PRESENT MUSIC OF THE 20TH CENTURY. ALL SCHOOLS, MOVEMENTS AND STYLES FROM THE TURN OF THE CENTURY TO THE PRESENT DAY WILL BE OFFERED. IT IS THE PRACTICAL AIM OF THE BOSTON MODERN ORCHESTRA PROJECT, INC. TO PROMOTE AND SUPPORT THE PERFORMANCES OF NEW COMPOSITIONS, UNKNOWN WORKS, NEWLY PUBLISHED EDITIONS AND SELDOM REPEATED WORKS FROM THE START OF THE 1900'S. BOSTON MODERN ORCHESTRA PROJECT, INC. HOPES TO CHALLENGE, ENTERTAIN AND EDUCATE ITS AUDIENCES BY PRESENTING A VARIETY OF CONCERTS, LECTURES AND ACTIVITIES COMPRISED OFMUSIC AND RELATED SUBJECTS FROM THE 20TH CENTURY. |
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| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
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| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 0 |
| IRS990/ReportOtherAssetsInd | 0 | 1 |
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| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 678498 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 552611 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 674627 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 3292357 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 500 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 230 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 730 |
| IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt | 0 | 1270659 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearAmt | 0 | 355613 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 131018 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 102400 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 174973 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 120250 |
| IRS990ScheduleA/OtherIncome170Grp/TotalAmt | 0 | 884254 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.66830 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.67540 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 2791686 |
| IRS990ScheduleA/SubstantialContributorsTotAmt | 0 | 500671 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 751771 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 634850 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 678498 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 552611 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 674627 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 3292357 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 4177341 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleD/ExpensesNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 1164830 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/OtherAssetsOrgGrp/BookValueAmt | 0 | 65961 |
| IRS990ScheduleD/OtherAssetsOrgGrp/Desc | 0 | DUE FROM RELATED PARTY |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/RevenueNotReportedFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 1187386 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | THE ORGANIZATION IS ORGANIZED AND OPERATED EXCLUSIVELY FOR CHARITABLE AND EDUCATIONAL PURPOSES. INCOME RELATED TO THESE PURPOSES IS EXEMPT FROM FEDERAL AND STATE INCOME TAXES UNDER THE PROVISIONS OF SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. UNRELATED BUSINESS INCOME WOULD BE TAXABLE ACCORDING TO APPLICABLE INTERNAL REVENUE CODE SECTIONS. THE ORGANIZATION REGULARLY REVIEWS AND EVALUATES ITS TAX POSITIONS TAKEN IN ITS FILED RETURNS AND RECOGNIZES THE BENEFIT FROM A TAX POSITION ONLY IF IT IS MORE LIKELY THAN NOT THAT THE POSITION WOULD BE SUSTAINED UPON AUDIT BASED SOLELY ON THE TECHNICAL MERITS OF THE TAX POSITION. THE ORGANIZATION ACCRUES INTEREST AND PENALTIES ON UNCERTAIN TAX POSITIONS AS A COMPONENT OF THE PROVISION FOR INCOME TAXES. THE ORGANIZATION FILES FEDERAL AND MASSACHUSETTS TAX RETURNS. THE STATUTE OF LIMITATIONS FOR THESE JURISDICTIONS IS GENERALLY THREE YEARS. THE ORGANIZATION HAD NO RETURNS UNDER EXAMINATION AS OF SEPTEMBER 30, 2018. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | PART X, LINE 2: |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 0 |
| IRS990ScheduleD/TotalBookValueOtherAssetsAmt | 0 | 65961 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 1164830 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 1187386 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 1187386 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 1164830 |
| IRS990ScheduleJ/AnyNonFixedPaymentsInd | 0 | 0 |
| IRS990ScheduleJ/BoardOrCommitteeApprovalInd | 0 | X |
| IRS990ScheduleJ/CompBasedOnRevenueOfFlngOrgInd | 0 | 0 |
| IRS990ScheduleJ/CompBsdNetEarnsFlngOrgInd | 0 | 0 |
| IRS990ScheduleJ/CompBsdNetEarnsRltdOrgsInd | 0 | 0 |
| IRS990ScheduleJ/CompBsdOnRevRelatedOrgsInd | 0 | 0 |
| IRS990ScheduleJ/CompensationCommitteeInd | 0 | X |
| IRS990ScheduleJ/EquityBasedCompArrngmInd | 0 | 0 |
| IRS990ScheduleJ/InitialContractExceptionInd | 0 | 0 |
| IRS990/ScheduleJRequiredInd | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BaseCompensationFilingOrgAmt | 0 | 103523 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BonusFilingOrganizationAmount | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BonusRelatedOrganizationsAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/CompensationBasedOnRltdOrgsAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/CompReportPrior990FilingOrgAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/CompReportPrior990RltdOrgsAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/DeferredCompensationFlngOrgAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/DeferredCompRltdOrgsAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/NontaxableBenefitsFilingOrgAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/NontaxableBenefitsRltdOrgsAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/OtherCompensationFilingOrgAmt | 0 | 38000 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/OtherCompensationRltdOrgsAmt | 0 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/PersonNm | 0 | GILBERT ROSE |