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Regulation (Details) - item		12 Months Ended
	Jan. 08, 2017	Dec. 31, 2019
Regulation [Line Items]
Number of debt-to-earnings measures		2
Failed programs	0
Number of ineligible years		3 years
Pass Status
Regulation [Line Items]
Average of median discretionary percentage		20.00%
Fails
Regulation [Line Items]
Number of consecutive years program has to fail both metrics to become ineligible		3 years
MInimum Number of Metric to Pass		1
Number of metrics that can't be failed for consecutive years		2 years
Minimum
Regulation [Line Items]
Average of median annual earning percentage		8.00%
Average of median discretionary percentage		20.00%
Minimum | Fails
Regulation [Line Items]
Average of median discretionary percentage		30.00%
Maximum
Regulation [Line Items]
Average of median annual earning percentage		12.00%
Average of median discretionary percentage		30.00%
Capella University
Regulation [Line Items]
Number of current programs in the Zone		1
Strayer University
Regulation [Line Items]
Number of current programs in the Zone		2

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

MInimum Number of Metric to Pass

+ References

No definition available.

+ Details

Name:	stra_MInimumNumberofMetrictoPass
Namespace Prefix:	stra_
Data Type:	xbrli:integerItemType
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:durationItemType
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 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 programs failing to meet specific guidelines.

+ References

No definition available.

+ Details

Name:	stra_NumberOfFailedPrograms
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

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

- Details

Name:	stra_ProgramStatusAxis=stra_PassStatusMember
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	stra_ProgramStatusAxis=stra_FailsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=stra_CapellaSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=stra_StrayerSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: