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Regulation (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 26, 2014 item | Sep. 11, 2014 item | Aug. 20, 2014 item | Dec. 31, 2016 state item | Apr. 29, 2015 USD ($)
Regulation [Line Items] |  |  |  |  |
Number of ineligible years |  |  |  | 3 years |
Minimum [Member] |  |  |  |  |
Regulation [Line Items] |  |  |  |  |
Average of median annual earning percentage. |  |  |  | 8.00% |
Average of median discretionary percentage |  |  |  | 20.00% |
Maximum [Member] |  |  |  |  |
Regulation [Line Items] |  |  |  |  |
Average of median annual earning percentage. |  |  |  | 12.00% |
Average of median discretionary percentage |  |  |  | 30.00% |
Strayer University |  |  |  |  |
Regulation [Line Items] |  |  |  |  |
Number of debt-to-earnings measures |  |  |  | 2 |
Number of current associate degree programs n the Zone |  |  |  | 2 |
Number of conducted compliance reviews |  |  |  | 4 |
Number of on-site reviews conducted | 2 | 1 | 1 |  |
Number of states in which compliance reviews were conducted | state |  |  |  | 3 |
Strayer University | Maximum [Member] |  |  |  |  |
Regulation [Line Items] |  |  |  |  |
Amount due to department of education | $ |  |  |  |  | $ 500

X
- Definition Amount due to the Department of Education based on an underpayment on a return to Title IV calculation. + References No definition available. + Details
Name: | stra_AmountDueToDepartmentOfEducation
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Average of median annual earning percentage. + References No definition available. + Details
Name: | stra_AverageOfMedianAnnualEarningPercentage
Namespace Prefix: | stra_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average of median discretionary percentage. + References No definition available. + Details
Name: | stra_AverageOfMedianDiscretionaryPercentage
Namespace Prefix: | stra_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Represents the number of current associate's degree programs considered in the "Zone". + References No definition available. + Details
Name: | stra_NumberOfCurrentAssociateDegreeProgramsInZone
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of newly required debt-to-earnings measures. + References No definition available. + Details
Name: | stra_NumberOfDebtToEarningsMeasures
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of years a program would be Title IV ineligible after failing both metrics for two out of three consecutive years or fails to pass at least one metric for four consecutive years. + References No definition available. + Details
Name: | stra_NumberOfIneligibleYears
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of on-site reviews conducted + References No definition available. + Details
Name: | stra_NumberOfOnSiteReviews
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of states in which compliance reviews were conducted + References No definition available. + Details
Name: | stra_NumberOfStatesInWhichComplianceReviewsWereConducted
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulation line items. + References No definition available. + Details
Name: | stra_RegulationLineItems
Namespace Prefix: | stra_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=stra_StrayerUniversityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |