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Nature of Business (Details)	Sep. 30, 2011 ac Instrument
Nature of Business (Textual) [Abstract]
Area of the Company's campus in Phoenix, Arizona	110

X

- Definition

Area of the Company's campus.

+ Details

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Namespace Prefix:	lope
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Nature of business.

+ Details

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