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Share-Based Compensation - Summary of Activity Related to Stock Options Granted under 2008 Plan (Parenthetical) (Detail)	Jun. 30, 2017 $ / shares
2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of closing stock price	$ 78.41

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PlanNameAxis=lope_TwoThousandEightEquityIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: