Payment For License Agreement

No definition available.

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

- Definition

Prepaid Expense, Amortization Period

+ References

No definition available.

+ Details

Name:	stra_PrepaidExpenseAmortizationPeriod
Namespace Prefix:	stra_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Schedule of Other Assets

+ References

No definition available.

+ Details

Name:	stra_ScheduleOfOtherAssetsLineItems
Namespace Prefix:	stra_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

Name:	us-gaap_PaymentsToAcquireLimitedPartnershipInterests
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_PrepaidExpenseNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=stra_LimitedPartnershipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=stra_JackWelchManagementInstituteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Other Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended		75 Months Ended
Other Assets - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2020	Dec. 31, 2031
Schedule of Other Assets [Line Items]
Prepaid expenses, net of current portion	$ 15,231		$ 15,231		$ 15,678
Capital contributions	$ 34	$ 394	$ 265	$ 490
Minimum \| Limited Partnerships
Schedule of Other Assets [Line Items]
Ownership percentage	3.00%		3.00%
Maximum \| Limited Partnerships
Schedule of Other Assets [Line Items]
Ownership percentage	5.00%		5.00%
Forecast
Schedule of Other Assets [Line Items]
Capital contributions							$ 1,800
Jack Welch Management Institute
Schedule of Other Assets [Line Items]
Payment for license agreement						$ 25,300
Prepaid expenses, net of current portion	$ 13,500		$ 13,500		$ 14,700
Prepaid expense, amortization period			15 years		15 years