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v3.19.3

Fair Value Measurement - Additional Information (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Accounts Payable and Accrued Liabilities |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Short-term portion of deferred payments | $ 1.2

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- Definition Represents the current portion of deferred payment liabilities. + References No definition available. + Details
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Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |