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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 647716 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 274871 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 522333 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | TO SPARK IN STUDENTS OF DIVERSE BACKGROUNDS AND TALENTS A PASSION FOR LEARNING, ACCOMPLISHMENT, AND CONTRIBUTION TO THEIR COMMUNITIES. |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 1580 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 1580 |
| IRS990/AllOtherContributionsAmt | 0 | 1732882 |
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| IRS990/AuditCommitteeInd | 0 | true |
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| IRS990/BooksInCareOfDetail/PersonNm | 0 | ROBIN E BENTLEY |
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| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | SEATTLE |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | WA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 98112 |
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| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 2494810 |
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| IRS990/CollectionsOfArtInd | 0 | false |
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| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 391371 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 3 | 419738 |
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| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 2 | PO BOX 790408 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 3 | 1201 ALASKAN WAY 200 |
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| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 98124 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 2 | 63101 |
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| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 0 | BLACKBAUD |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 1 | FOOD SERVICES OF AMERICA |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 2 | US BANK |
| IRS990/ContractorCompensationGrp/ContractorName/PersonNm | 3 | MITHUNPIER 56 |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | SOFTWARE MANAGER |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | CATERER |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | CREDIT CARD PROVIDER |
| IRS990/ContractorCompensationGrp/ServicesDesc | 3 | ARCHITECT |
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| IRS990/Desc | 0 | The Bush School provides innovative experiential education to 656 students from Kindergarten through Twelfth Grade. The Bush School prepares students for a lifetime of learning, focusing on direct experiences, collaboration, and contribution to our local, national, and international communities. The Bush School is accredited by the Northwest Association of Independent Schools, National Association of Independent Schools, the Northwest Accreditation Commission, and the State of Washington. |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 17 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 18 | X |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 20 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 21 | X |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | BECKY GUZAK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | PEGGY O'NEILL SKINNER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | TRACY STANTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | CURTIS VREDENBURG RIX |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | MIKE GALGON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | ALDEN GARRETT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | ERIC FAHLMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | ANN KAWASAKI ROMERO |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | C'Ardiss Gleser |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | Chris Chickadel |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | SERGIO CHIN-LEY |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 24 | Percy Abram |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 25 | JAMES FRANKLIN V |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 28 | Jo Ito |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 29 | Susan Radtke |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 28 | 119057 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 29 | 126718 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| 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 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | VICE PRESIDENT (eff. 1/1/17) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | VICE PRESIDENT (until 1/1/17) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | SECRETARY |
| 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 | Asst Head for Finance & Oper. |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | Head of School |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 25 | MIDDLE SCHOOL DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 26 | Upper School Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 27 | Director of Admissions |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 28 | Athletic Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 29 | Director of Development |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1931 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | true |
| IRS990/FundraisingAmt | 0 | 493245 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 197554 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 45700 |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 6599 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 2547 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GamingDirectExpensesAmt | 0 | 0 |
| IRS990/GamingGrossIncomeAmt | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 22 |
| IRS990/GrantAmt | 0 | 2975257 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 47495 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 0 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 2975257 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 2975257 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | true |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/OtherAmt | 0 | 6599 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 2547 |
| IRS990/GrossReceiptsAmt | 0 | 23679306 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 36399 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 597823 |