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Subsequent Events (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Jul. 28, 2011
Subsequent Events (Textuals) [Abstract]
Additional amount authorized by Board of Directors		$ 25,000
Repurchase authorization, expiration date	September 30, 2012

X

- Definition

Additional amount authorized by Board of Directors.

+ Details

Name:	lope_AdditionalAmountAuthorizedByBoardOfDirectors
Namespace Prefix:	lope
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Repurchase authorization expiration date.

+ Details

Name:	lope_RepurchaseAuthorizationExpirationDate
Namespace Prefix:	lope
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Subsequent events.

+ Details

Name:	lope_SubsequentEventsTextualsAbstract
Namespace Prefix:	lope
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration