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Nature of Business - Additional Information (Detail)	Sep. 30, 2012 acre
Nature Of Operations [Line Items]
Area of the Company's campus in Phoenix, Arizona	115

X

- Definition

Area of the company's campus.

+ References

No definition available.

+ Details

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

X

- Details

Name:	lope_NatureOfOperationsLineItems
Namespace Prefix:	lope_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration