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Revenue Recognition - Schedule of Learn and Earn Scholarship Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	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

X

- 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

X

- 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

X

- 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