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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, type extensible enumeration atge:InvestmentInRabbiTrustMember atge:InvestmentInRabbiTrustMember
Principle balance $ 558,283 $ 558,283
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 405,100 402,800
Term B Loan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Principle balance 153,333 153,333
Term B Loan | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 153,800 153,800
Accounts Receivable | Credit extension program | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans Receivable, Fair Value Disclosure 26,200 27,100
Nonqualified Deferred Compensation Plan | Accrued Liabilities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation 14,900 13,500
Nonqualified Deferred Compensation Plan | Prepaid Expenses and Other Current Assets | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of credit extension programs $ 13,500 $ 12,800