XML 122 R101.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Subsequent Events (Details) - Subsequent Event - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Jan. 31, 2019 | Feb. 28, 2019
Subsequent Events |  |
Reduction in deferred tax assets |  | $ (11.5)
Site visit duration | 6 months |

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- Definition A decrease in deferred tax assets due to changes in a Company's compensation and benefit plans. + References No definition available. + Details
Name: | stra_DeferredTaxAssetReductionDueToCompensationAndBenefitPlanChanges
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The duration of a visit at a company site. + References No definition available. + Details
Name: | stra_SiteVisitDuration
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |