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Revenue Recognition - Schedule of Graduation Fund liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Graduation Fund [Roll Forward]
Balance at beginning of period	$ 46,842	$ 52,024
Revenue deferred	14,543	12,647
Benefit redeemed	(16,931)	(16,295)
Balance at end of period	$ 44,454	$ 48,376

X

- Definition

Current year redemptions of graduation fund credits by students.

+ References

No definition available.

+ Details

Name:	stra_BenefitRedeemed
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to graduation fund liability.

+ References

No definition available.

+ Details

Name:	stra_GraduationFundLiability
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

X

- Definition

Additional graduation fund liability generated in the current year for services to be performed in the future.

+ References

No definition available.

+ Details

Name:	stra_RevenueDeferred
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration