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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 1392 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 7973 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 1350 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | THE MISSION OF THE EASTERN CONNECTICUT SYMPHONY, INC. IS TO INSPIRE, EDUCATE AND CONNECT OUR COMMUNITIES THROUGH LIVE ORCHESTRAL MUSIC. |
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| IRS990/AdvertisingGrp/TotalAmt | 0 | 13450 |
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| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 8412 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 22832 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 31244 |
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| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
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| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 8604432876 |
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| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | NEW LONDON |
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| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 06320 |
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| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 162926 |
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| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | false |
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| IRS990/DonorAdvisedFundInd | 0 | false |
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| IRS990/EmployeeCnt | 0 | 79 |
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| IRS990/ExpenseAmt | 0 | 687235 |
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| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 7800 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 7800 |
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| IRS990/ForeignFinancialAccountInd | 0 | false |
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| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form8899Filedind | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| 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 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 12 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 13 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 14 | 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 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 0 |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | JOHN ANTHONY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | CATHERINE MARRION |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | JOHN PAUL MORALES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | GARY UPTON BIRKHAMSHAW |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | TOM BERL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | EDWARD O'DONNELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | JERRY OLSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | NAOMI OTTERNESS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | SVETLANA KASEMBEG |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | ANISH SHAH |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | ELLEN CUMMINGS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | ANNE WILKINSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | TOM CASTLE |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 71653 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 0 |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | DIRECTOR |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | VICE PRESIDE |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | TREASURER |
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| IRS990/InsuranceGrp/TotalAmt | 0 | 16294 |
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| IRS990/MissionDesc | 0 | THE MISSION OF THE EASTERN CONNECTICUT SYMPHONY, INC. IS TO INSPIRE, EDUCATE AND CONNECT OUR COMMUNITIES THROUGH LIVE ORCHESTRAL MUSIC. |
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| IRS990/OtherExpensesGrp/Desc | 0 | CONTRACT MUSICIANS |
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| IRS990/OtherExpensesGrp/Desc | 3 | INVESTMENT FEES |
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| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 147813 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 76366 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 36539 |
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| IRS990/OtherExpensesGrp/TotalAmt | 1 | 76366 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 36539 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 20248 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 541800 |
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| IRS990/PrincipalOfficerNm | 0 | BOB REED |
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| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 317487 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 329095 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 298146 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 324354 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 283621 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 1552703 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 103499 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 91518 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 119953 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 119853 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 90554 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 525377 |
| IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt | 0 | 274990 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearAmt | 0 | 12752 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 19008 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 20831 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 20794 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 16259 |
| IRS990ScheduleA/OtherIncome170Grp/TotalAmt | 0 | 89644 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.70900 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.71380 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 1552703 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 317487 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 329095 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 298146 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 324354 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 283621 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 1552703 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 2190039 |
| IRS990ScheduleA/UnrelatedBusinessNetIncm170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 22315 |
| IRS990ScheduleA/UnrelatedBusinessNetIncm170Grp/TotalAmt | 0 | 22315 |
| IRS990/ScheduleBRequiredInd | 0 | true |
| IRS990ScheduleD/BoardDesignatedBalanceEOYPct | 0 | 1.00000 |
| IRS990ScheduleD/CYEndwmtFundGrp/AdministrativeExpensesAmt | 0 | -13947 |
| IRS990ScheduleD/CYEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 2597017 |
| IRS990ScheduleD/CYEndwmtFundGrp/EndYearBalanceAmt | 0 | 2594893 |
| IRS990ScheduleD/CYEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 11823 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/AdministrativeExpensesAmt | 0 | -15428 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 2533496 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 2597017 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 78949 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/AdministrativeExpensesAmt | 0 | -15090 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 2650919 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 2533496 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 73679 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/AdministrativeExpensesAmt | 0 | -16332 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 2788155 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 2650919 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 136692 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/AdministrativeExpensesAmt | 0 | -16119 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 2560487 |