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Regulation (Details) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2016 item | Sep. 30, 2016 USD ($) item state
Regulation [Line Items] |  |
Average of median annual earning percentage. |  | 8.00%
Average of median discretionary percentage |  | 20.00%
Number of categories of borrower defenses |  | 3
Number of states needed for state authorization reciprocity agreement | state |  | 2
Number of years an adverse action must be disclosed |  | 5 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
Earnings measurement times Poverty Guideline |  | 1.5
Amount of liability triggering event | $ |  | $ 750,000
Percentage of current assets triggering event |  | 10.00%
Percentage of annual Title IV disbursements |  | 10.00%
Number of conducted compliance reviews |  | 4
Number of states in which compliance reviews were conducted | state |  | 3
Number of reviews also covered compliance with additional agencies |  | 2
Strayer University | Minimum [Member] |  |
Regulation [Line Items] |  |
Years after graduation |  | 2 years
Strayer University | Maximum [Member] |  |
Regulation [Line Items] |  |
Years after graduation |  | 4 years
Strayer University | Forecast |  |
Regulation [Line Items] |  |
Number of current associate degree programs n the Zone | 2 |

X
- Definition Represents the amount of liability arising from an audit, investigation, or similar action initiated by a state, federal, or other oversight entity, including settlements, that is based on claims related to the making of federal loans or the provision of educational service that would trigger an event leading to determination institution isn't able to meet financial or administrative obligations based on U.S. Department of Education ruling. + References No definition available. + Details
Name: | stra_AmountOfLiabilityTriggeringEvent
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 times the mean or median annual earnings of graduates is multiplied by the government issued Poverty Guideline. + References No definition available. + Details
Name: | stra_EarningsMeasurementTimesPovertyGuideline
Namespace Prefix: | stra_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of categories of borrower's defenses that could be asserted by students with Federal Direct Loans. + References No definition available. + Details
Name: | stra_NumberOfCategoriesOfBorrowerDefenses
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 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 reviews that also covered compliance with additional agencies. + References No definition available. + Details
Name: | stra_NumberOfReviewAlsoCoveredComplianceWithAdditionalAgencies
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 Represents the number of states needed for a authorization reciprocity agreement. + References No definition available. + Details
Name: | stra_NumberOfStatesNeededForStateAuthorizationReciprocityAgreement
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of years that must be disclosed if an adverse event occurs based on proposed regulations. + References No definition available. + Details
Name: | stra_NumberOfYearsAdverseActionMustBeDisclosed
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of the school's annual Title IV disbursements. + References No definition available. + Details
Name: | stra_PercentageOfAnnualTitleIvDisbursements
Namespace Prefix: | stra_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of current assets that if equal to the amount of liability arising from an audit, investigation, or similar action initiated by a state, federal, or other oversight entity, including settlements, that is based on claims related to the making of federal loans or the provision of educational service that would trigger an event leading to determination institution isn't able to meet financial or administrative obligations based on U.S. Department of Education ruling. + References No definition available. + Details
Name: | stra_PercentageOfCurrentAssetsTriggeringEvent
Namespace Prefix: | stra_
Data Type: | num:percentItemType
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

X
- Definition Represents year after graduation + References No definition available. + Details
Name: | stra_YearsAfterGraduation
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- 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: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |