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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jan. 17, 2025
Dec. 31, 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   397,400 389,500
Term B Loan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Principle balance $ 153,300 253,333 253,333
Term B Loan | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value   255,100 254,900
Accounts Receivable | Credit extension program      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans Receivable, Fair Value Disclosure   26,400 28,900
Nonqualified Deferred Compensation Plan | Accrued Liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferred compensation   12,100 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   $ 12,800 $ 13,200