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Treasury Stock (Details) (USD $) In Thousands, except Share data	6 Months Ended	10 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Aug. 16, 2010
Treasury Stock (Textual) [Abstract]
Authorized to repurchase common stock			25,000
Expiration date on the repurchase authorizations	Sep. 30, 2011	Sep. 30, 2011
Common stock acquired, shares	1,557	1,607
Aggregate cost shares of common stock	$ 22,369	$ 23,151

X

- Definition

Common stock acquired, shares.

+ Details

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Namespace Prefix:	lope
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expiration date on the repurchase authorizations.

+ Details

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Namespace Prefix:	lope
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ Details

Name:	lope_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	lope
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Treasury Stock.

+ Details

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

X

- Definition

Cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 1

-Section B

-Paragraph 7

-Subparagraph b

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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