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| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 1000 |
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| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 294001 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OnBehalfOfIssuerInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OrgFiledInLieuOfForm1041Ind | 0 | false |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 4267 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 3992 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 19270 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 27529 |
| IRS990/OtherExpensesGrp/Desc | 0 | Dues, licenses, service fees |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 328 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 328 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | Miscellaneous |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 0 | 6822 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 6822 |
| IRS990/OtherRevenueTotalAmt | 0 | 6822 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 42778 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 40448 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 203287 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 286513 |
| IRS990/OthNotesLoansReceivableNetGrp/EOYAmt | 0 | 0 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PaymentsToAffiliatesGrp/TotalAmt | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 3780 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 3536 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 17025 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 24341 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 0 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 10000 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 3408 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 2088 |
| IRS990/PrincipalOfficerNm | 0 | Tara Holmes |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | Event admissions |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | Rental Income |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | Sales / workshop fees |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 3085 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 32670 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 302003 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 3085 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 32670 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 302003 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | Randall Courses and Classes. The museum offers classes for children, youth, and adults in a variety of media including art, ceramics, woodworking, STEM and science. Over hundreds of children and adults participated together in family or parent-child classes in ceramics, woodworking, toddler art, sensory development and gardening. Young people participated in classes for youth ages six through twelve years including robotics, bicycle repair (physics), Corona Heights Explorers (nature and art), phenomenal physics, gardening, instrument making, woodworking, ceramics, astronomy, renewable energy and kitchen chemistry. The teen animal care class trains teenagers to work in the museums animal room. Adults only classes included evening, weekend, and early-bird classes included ceramics, woodworking, Dobsonian telescope making, and audio electronics. In addition to the four seasonal course sessions, there was the capacity to hold classes during the winter and spring holiday breaks. Registration is done online and at Rec & Park facilities. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 111139 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 189897 |
| IRS990/ProgSrvcAccomActy3Grp/Desc | 0 | Randall Summer Camps. Randall Museum Friends administered two summer camp programs for this fiscal year. Randall Museum Day Camps continue to operate at full capacity. Two-hundred seventy-two children, ages six through twelve years, participated in two-week programs that included classes in inventions, animal art, marine science, theater art, opera, robotics, animal end tables, theater play, hip hop, monster ceramics, stories in clay, Japanese inspired ceramics, cross cultural art, space camp and anatomy. Families had the option of using before and after-care. Eight children went to a five-day overnight nature program at Camp Mather just outside Yosemite National Park. |
| IRS990/ProgSrvcAccomActy3Grp/ExpenseAmt | 0 | 65561 |
| IRS990/ProgSrvcAccomActy3Grp/RevenueAmt | 0 | 110569 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 423313 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 1000 |
| IRS990/PYInvestmentIncomeAmt | 0 | 96442 |