XML 55 R28.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Nature of Business - Additional Information (Detail) - Grand Canyon University [Member] | 9 Months Ended
--- | ---
Sep. 30, 2018 Colleges Degrees
Nature Of Operations [Line Items] |
Description of area of campus in Phoenix, Arizona | 262 acre campus
Number of colleges in Phoenix, Arizona | Colleges | 9
Number of degree programs and certificates | Degrees | 262

X
- Definition Nature Of Operations [Line Items] + References No definition available. + Details
Name: | lope_NatureOfOperationsLineItems
Namespace Prefix: | lope_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of colleges. + References No definition available. + Details
Name: | lope_NumberOfColleges
Namespace Prefix: | lope_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of degree programs offered. + References No definition available. + Details
Name: | lope_NumberOfDegreeProgramsOffered
Namespace Prefix: | lope_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Real estate property description. + References No definition available. + Details
Name: | lope_RealEstatePropertyDescription
Namespace Prefix: | lope_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lope_GrandCanyonUniversityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |