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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	Jul. 17, 2012
Subsequent Events (Textual)
Amount repaid under revolving credit facility during period	$ 15.0

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- Definition

The cash outflow to pay off an obligation from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity.

+ References

No definition available.

+ Details

Name:	stra_RepaymentOfRevolvingCreditFacility
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	stra_SubsequentEventsTextualAbstract
Namespace Prefix:	stra_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration