| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 2435027 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 2884246 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 94027 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 116512 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | POLYTECHNIC IS AN INDEPENDENT, COEDUCATIONAL, DAY SCHOOL FOR APPROXIMATELY 860 STUDENTS. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 70195 |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 16389 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 38241 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 124825 |
| IRS990/AllOtherContributionsAmt | 0 | 7750558 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 217587 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 2920940 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 3138527 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | KEITH HUYSSOON |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6263966300 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 1030 E CALIFORNIA BLVD |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | PASADENA |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 91106 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 1 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 1980225 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 1387316 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 90662 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 470722 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 181324 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 742708 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 299453 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 113487 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 2801 HYPERION AVE 103 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 11454 SAN VICENTE BLVD 1ST FLOOR |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | LOS ANGELES |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | LOS ANGELES |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | CA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | CA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 90027 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 90049 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | WARREN TECHENTIN ARCHITECTURE |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | THE CENTURION GROUP |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | ARCHITECTURAL SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | SECURITY |
| IRS990/ContriRptFundraisingEventAmt | 0 | 41821 |
| IRS990/CreditCounselingInd | 0 | 1 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 7792379 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 4193320 |
| IRS990/CYInvestmentIncomeAmt | 0 | 7375421 |
| IRS990/CYOtherExpensesAmt | 0 | 13633136 |
| IRS990/CYOtherRevenueAmt | 0 | 195015 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 30407284 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 5316092 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 22618051 |
| IRS990/CYTotalExpensesAmt | 0 | 40454007 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 2025756 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 9500 |
| IRS990/CYTotalRevenueAmt | 0 | 45770099 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 1 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 3312169 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 3226890 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 54514 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 490624 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 2180550 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 2725688 |
| IRS990/Desc | 0 | POLYTECHNIC SCHOOL IS AN INDEPENDENT, COEDUCATIONAL DAY SCHOOL FOR APPROXIMATELY 860 STUDENTS IN KINDERGARTEN THROUGH GRADE TWELVE. THE SCHOOL WAS ESTABLISHED IN 1907 AND IS LOCATED ON A 15 ACRE CAMPUS IN PASADENA, CALIFORNIA. THE SCHOOL OFFERS A STRONG ACADEMIC PROGRAM, ACTIVITIES BEYOND THE CLASSROOM INCLUDING ATHLETICS, OUTDOOR EDUCATION, COMMUNITY SERVICE, AND THE VISUAL AND PERFORMING ARTS. THE SCHOOL STRIVES TO REFLECT THE CULTURAL, ETHNIC AND ECONOMIC DIVERSITY PRESENT IN THE PASADENA AND SAN GABRIEL VALLEY AREA. THE SCHOOL OFFERS SMALL CLASSES WHICH ENCOURAGE DEEP STUDENT-FACULTY INTERACTION, FACILITIES THAT ENHANCE THE ABILITY OF THE FACULTY TO TEACH, AND OPPORTUNITIES FOR FACULTY DEVELOPMENT. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 553 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/EscrowAccountInd | 0 | 0 |
| IRS990/EscrowAccountLiabilityGrp/BOYAmt | 0 | 150845 |
| IRS990/EscrowAccountLiabilityGrp/EOYAmt | 0 | 162637 |
| IRS990/ExpenseAmt | 0 | 33966579 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 33057 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 33057 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 109401 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 109401 |
| IRS990/FeesForServicesProfFundraising/FundraisingAmt | 0 | 9500 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 9500 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 221095 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 221095 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 22 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 23 | 60.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 24 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 25 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 26 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 27 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 28 | 50.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 29 | 50.00 |
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| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
| 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/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 |
| 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/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 0 |
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| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 22 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 23 | 111648 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 24 | 44564 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 25 | 40909 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 26 | 28772 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 27 | 54249 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 28 | 45459 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 29 | 18000 |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | HUNT MELANY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | SABBAG MAGGIE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | BABCOCK JOHN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | HSIEH MING |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | BLODGETT MARY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | BRYANT JOEL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | CALLAHAN EZRA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | CARDENAS ROSALINA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | CEVA KRISTIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | CHANG TOM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | DESAI PRIYA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | EDWARDS RUTH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | FRANK JOHN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | ANNICK NANCY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | HUDNUT ALEXANDER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | LIU STANLEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | MACPHERSON LORI |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | MOLZ TODD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | PRADO MARICRUZ |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | RICE PETER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | ROUNTREE STEPHEN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 22 | TERRILE JAMES |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 23 | BRACKER JOHN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 24 | HUYSSOON KEITH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 25 | FAY JONAHTAN R |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 26 | ALLEN COLIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 27 | THOMPSON SHARON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 28 | FLEISCHER JENNIFER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 29 | HAASE MARTIN |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 22 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 24 | 227685 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 25 | 184453 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 26 | 172249 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 27 | 167967 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 28 | 166805 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 29 | 150000 |
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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/TitleTxt | 0 | BOARD CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TREASURER |
| 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 | CHIEF FINANCIAL OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | SUMMER SCHOOL DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 26 | ADVANCEMENT DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 27 | ASSISTANT HEAD OF SCHOOL |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 28 | UPPER SCHOOL DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 29 | ADVANCEMENT |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/Form990TFiledInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1907 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 41821 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 29990 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 41946 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 4686492 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 23 |
| IRS990/GrantAmt | 0 | 4193320 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 40000 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 0 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 4193320 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 4193320 |
| IRS990/GrantsToIndividualsInd | 0 | 1 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 1 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 38342133 |
| IRS990/GrossReceiptsAmt | 0 | 79570991 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 241738 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 21 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 49 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 4635 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 41718 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 185411 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 231764 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 16118 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 241404 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 215675 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 473197 |
| IRS990/InterestGrp/FundraisingAmt | 0 | 21328 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 191951 |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 853114 |
| IRS990/InterestGrp/TotalAmt | 0 | 1066393 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 2688929 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 2688929 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 52587369 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 31459828 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 43134458 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 67857445 |
| IRS990/InvestTaxExemptBondsInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 126 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 22494288 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 68304622 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 66975812 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 89470100 |
| IRS990/LegalDomicileStateCd | 0 | CA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 33655641 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 115261 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MiscellaneousRevenueGrp/ExclusionAmt | 0 | 26489 |
| IRS990/MiscellaneousRevenueGrp/TotalRevenueColumnAmt | 0 | 26489 |
| IRS990/MissionDesc | 0 | THE MISSION OF POLYTECHNIC SCHOOL IS TO DEVELOP THE INTELLECT, TALENTS, AND CHARACTER OF EACH STUDENT IN A COMMUNITY OF LEARNING DEDICATED TO PRINCIPLES OF ACADEMIC EXCELLENCE THAT VALUES THE UNIQUENESS AND DIGNITY OF EACH MEMBER AND FOSTERS PERSONAL RESPONSIBLITY AND SERVICE TO OTHERS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 142927014 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 147042750 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 4686492 |