Name:	stra_DefinedContributionPlanEmployerMatchingContributionPercentFirstTier
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Data Type:	dtr-types:percentItemType
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Period Type:	duration

Percentage employer matches of first tier of the employee's percentage contribution.

No definition available.

Name:	stra_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchFirstTier
Namespace Prefix:	stra_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of second tier of the employee's percentage contribution.

No definition available.

Name:	stra_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchSecondTier
Namespace Prefix:	stra_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Second tier of percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	stra_DefinedContributionPlanEmployerMatchingContributionPercentSecondTier
Namespace Prefix:	stra_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Employee stock purchase plan, maximum percentage of purchase an employee can make on eligible compensation.

No definition available.

Name:	stra_EmployeeStockPurchasePlanMaximumPercentageOfPurchaseEmployeeCanMakeOnEligibleCompensation
Namespace Prefix:	stra_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Employee stock purchase plan, percentage of purchase price from market value.

No definition available.

Name:	stra_EmployeeStockPurchasePlanPercentageOfPurchasePriceFromMarketValue
Namespace Prefix:	stra_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. Other employee benefit expense includes, but is not limited to, service component of net periodic benefit cost for defined benefit plan. Excludes compensation cost in cost of good and service sold.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(4))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

Name:	us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

Name:	us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.