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Revenue Recognition - Schedule of Graduation Fund liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Graduation Fund [Roll Forward] |  |
Balance at beginning of period | $ 44,480 | $ 46,842
Revenue deferred | 20,300 | 20,173
Benefit redeemed | (27,662) | (22,535)
Balance at end of period | $ 37,118 | $ 44,480

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- Definition Contract With Customer, Liability, Current, Graduation Fund + References No definition available. + Details
Name: | stra_ContractWithCustomerLiabilityCurrentGraduationFund
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract With Customer, Liability, Revenue Deferred, Graduation Fund + References No definition available. + Details
Name: | stra_ContractWithCustomerLiabilityRevenueDeferredGraduationFund
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contract With Customer, Liability, Revenue Recognized, Graduation Fund + References No definition available. + Details
Name: | stra_ContractWithCustomerLiabilityRevenueRecognizedGraduationFund
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Graduation Fund [Roll Forward] + References No definition available. + Details
Name: | stra_GraduationFundRollForward
Namespace Prefix: | stra_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration