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Regulatory - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Loss Contingencies [Line Items]
Pell grants returns reserve	$ 3,450

X

- Definition

Reserve for estimated loss.

+ References

No definition available.

+ Details

Name:	lope_ReserveForEstimatedLoss
Namespace Prefix:	lope_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration