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Revenue Recognition - Schedule of Learn and Earn Scholarship Liability (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Learn And Earn [Roll Forward] |  |
Balance at beginning of period | $ 37,118 | $ 44,480
Revenue deferred | 15,084 | 16,358
Benefit redeemed | (14,482) | (17,054)
Balance at end of period | $ 37,720 | $ 43,784

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- Definition Contract With Customer, Liability, Current, Learn And Earn Scholarship + References No definition available. + Details
Name: | stra_ContractWithCustomerLiabilityCurrentLearnAndEarnScholarship
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract With Customer, Liability, Revenue Deferred, Learn And Earn Scholarship + References No definition available. + Details
Name: | stra_ContractWithCustomerLiabilityRevenueDeferredLearnAndEarnScholarship
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contract With Customer, Liability, Revenue Recognized, Learn And Earn Scholarship + References No definition available. + Details
Name: | stra_ContractWithCustomerLiabilityRevenueRecognizedLearnAndEarnScholarship
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Learn And Earn Scholarship + References No definition available. + Details
Name: | stra_LearnAndEarnScholarshipRollForward
Namespace Prefix: | stra_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration