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Revenue Recognition - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) course term
Graduation Fund [Line Items] |
Number of free courses | course | 1
Number of successfully completed courses | course | 3
Consecutive terms of non attendance in which Graduation Fund credits will be lost | term | 1
Expected collection period of current tuition receivable | 12 months
Graduation fund estimated to be redeemed | $ | $ 21.9
Unbilled receivables | $ | $ 0.6
Minimum |
Graduation Fund [Line Items] |
Expected collection period of noncurrent tuition receivable | 2 years
Deferred acquisition costs, amortization period | 1 year
Maximum |
Graduation Fund [Line Items] |
Expected collection period of noncurrent tuition receivable | 4 years
Deferred acquisition costs, amortization period | 2 years

X
- Definition Represents the number of consecutive term of non-attendance in which Graduation Fund credits will be lost. + References No definition available. + Details
Name: | stra_ConsecutiveTermsOfNonAttendanceInWhichGraduationFundCreditsWillBeLost
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Acquisition Costs, Amortization Period + References No definition available. + Details
Name: | stra_DeferredAcquisitionCostsAmortizationPeriod
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated amount of graduation fund to be redeemed in the next twelve months. + References No definition available. + Details
Name: | stra_EstimatedGraduationFundToBeRedeemedNextTwelveMonths
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Expected collection period of tuition receivable current. + References No definition available. + Details
Name: | stra_ExpectedCollectionPeriodOfTuitionReceivableCurrent
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected collection period of tuition receivable noncurrent. + References No definition available. + Details
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Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of free courses. + References No definition available. + Details
Name: | stra_NumberOfFreeCourses
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of successfully completed courses. + References No definition available. + Details
Name: | stra_NumberOfSuccessfullyCompletedCourses
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |