Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment, type extensible enumeration	atge:InvestmentInRabbiTrustMember	atge:InvestmentInRabbiTrustMember
Principle balance	$ 658,283	$ 658,283
Assets measured at fair value using Level 3	0	0
Liabilities measured at fair value using Level 3	0	0
Senior Secured Notes Due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principle balance	404,950	404,950
Senior Secured Notes Due 2028 | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	401,800	389,500
Term B Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principle balance	253,333	253,333
Term B Loan | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	253,800	254,900
Accounts Receivable | Credit extension program
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	27,100	28,900
Nonqualified Deferred Compensation Plan | Accrued Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation	12,700	12,200
Nonqualified Deferred Compensation Plan | Prepaid Expenses and Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of credit extension programs	$ 12,900	$ 13,200