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Regulation (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) item | Dec. 31, 2014 state item
Minimum [Member] |  |
Regulation [Line Items] |  |
Average of median annual earning percentage | 8.00% |
Average of median discretionary percentage | 20.00% |
Maximum |  |
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 ineligible years | 3 years |
Number of current associate degree programs in the Zone | 2 |
Number of consecutive years program has to fail both metrics to become ineligible | 2 years |
Number of consecutive years program has to fail one metric to become ineligible | 4 years |
Number of metric that can't failed for consecutive years | 1 |
Number of guidance documents | 2 |
Number of conducted compliance reviews |  | 2
Number of reviews in which no further action was required |  | 3
Number of on-site reviews conducted |  | 4
Number of states in which compliance reviews were conducted | state |  | 3
Strayer University | Maximum |  |
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 metric that can't be failed over consecutive years or else the program becomes Title IV ineligible. + References No definition available. + Details
Name: | stra_MetricsThatCanNotBeFailedForConsecutiveYears
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 consecutive years program would become Title IV ineligible after both failing metrics. + References No definition available. + Details
Name: | stra_NumberOfConsecutiveYearsProgramWouldBecomeIneligible
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of consecutive years program would become Title IV ineligible after one failing metric. + References No definition available. + Details
Name: | stra_NumberOfConsecutiveYearsProgramWouldBecomeIneligibleAfterFailingOneMetric
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
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 The number of guidance documents. + References No definition available. + Details
Name: | stra_NumberOfGuidanceDocuments
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 reviews in which no further action was required. + References No definition available. + Details
Name: | stra_NumberOfReviewInWhichNoFurtherActionWasRequired
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
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Period Type: | duration

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

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

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