XML 70 R55.htm IDEA: XBRL DOCUMENT
v3.20.2

Summary of Significant Accounting Policies - (Marketable Securities) (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | ---
Marketable Securities [Line Items] |  |
Marketable securities | $ 8,968 | $ 8,680
Bond Mutual Fund [Member] |  |
Marketable Securities [Line Items] |  |
Marketable securities | 2,397 | 2,229
Stock Mutual Funds [Member] |  |
Marketable Securities [Line Items] |  |
Marketable securities | $ 6,571 | $ 6,451

X
- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_MarketableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=atge_BondMutualFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=atge_StockMutualFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |