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Acquisitions (Acquired Intangible Assets Subject to Amortization and Values and Estimated Useful Lives) (Detail) - OnCourse Learning [Member] $ in Thousands	May 31, 2019 USD ($)
Business Acquisition [Line Items]
Amortizable intangible assets, estimated useful lives	9 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets, finite lived	$ 26,400
Amortizable intangible assets, estimated useful lives	11 years
Curriculum/Software [Member]
Business Acquisition [Line Items]
Intangible assets, finite lived	$ 11,600
Amortizable intangible assets, estimated useful lives	6 years
Course Delivery Technology
Business Acquisition [Line Items]
Intangible assets, finite lived	$ 6,700
Amortizable intangible assets, estimated useful lives	5 years

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

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

X

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472

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Balance Type:	debit
Period Type:	instant

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- Details

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X

- Details

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X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=atge_CurriculumSoftwareMember
Namespace Prefix:
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X

- Details

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