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Restructuring and Related Charges (Details) - item	1 Months Ended	9 Months Ended
	Oct. 31, 2013	Sep. 30, 2016
Restructuring and Related Charges [Abstract]
Campus location closed	20
Lease marginal borrowing rate		4.50%

X

- Definition

Campus location closed.

+ References

No definition available.

+ Details

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X

- Definition

Marginal borrowing rate of lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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