Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023	Nov. 06, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Contributes percentage	6.00%
Matching and discretionary contributions expense	$ 21,900,000	$ 19,700,000	$ 17,900,000
Authorized amount	$ 25,000
Number of ESPP issuable				500,000
Market price	90.00%
Brokerage commissions and administrative fees, percentage	10.00%
Total share issued	17,148	19,666	18,463
Nonqualified Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Contributes percentage	6.00%
Deferred Compensation Plan, Maximum Percentage of Deferment of Participant's Salary	50.00%
Deferred Compensation Plan, Maximum percentage of participant's Bonus or Board Fee	100.00%
Deferred Compensation Plan Assets	$ 12,800,000	$ 13,200,000
Investment, Type [Extensible Enumeration]	atge:InvestmentInRabbiTrustMember	atge:InvestmentInRabbiTrustMember
Accrued Liabilities [Member] | Nonqualified Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Liability, Current	$ 13,500,000	$ 12,200,000