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Debt (Additional Information) (Details) - USD ($) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 22, 2022 | Apr. 11, 2022 | Mar. 11, 2022 | Aug. 12, 2021 | Jul. 29, 2021 | Mar. 01, 2021 | Feb. 12, 2021 | Mar. 24, 2020 | Apr. 13, 2018 | Jun. 30, 2022 | Mar. 31, 2024 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2016
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  |  |  |  | $ 100,861,000 |  |  |  | $ 291,000,000 |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | 71,000 |  |  |  | 0 |  |
Line of Credit facility, initiation date |  |  |  |  |  |  |  |  | Apr. 13, 2018 |  |  |  |  |  |  |  |  |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | 2,895,000 |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | (4,525,000) |  |
Interest Rate Swap | Interest Expense. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  |  |  |  | $ (4,500,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Revolver | LIBOR Floor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |
Revolver | LIBOR Floor | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |  |  |
Revolver | LIBOR Floor | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  |  | 4.25% |  |  |  |  |  |
Revolver | Alternate Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |
Revolver | Alternate Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |
Walden Title IV Letter Of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 84,000,000.0 |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |
Undrawn amount on letters of credit |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |  |  |  |
De Vry University Title IV Letter Of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  | 68,400,000 |  | $ 68,400,000
Letter Of Credit Title Iv Disbursement Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Letter of credit, repayment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Credit annual fee percentage reimbursement |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Prior Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  |  |  |  |  |  |  | Apr. 13, 2023 |  |  |  |  |  |  |  |  |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  | 6,000,000 |  |
Prior Revolving Credit Facility | Interest Expense. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000.0 |  |  |  |  |  |
Prior Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% |
Prior Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% |
Prior Revolving Credit Facility | Eurocurrency Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |
Prior Revolving Credit Facility | Eurocurrency Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |
Term Loan B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 850,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt | $ 100,000,000.0 |  | $ 396,700,000 |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |
Debt Instrument, Issuance Price, Percent Of Principal Amount |  |  |  | 99.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuance Discount, Percent |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |  |  |  |
Asset sale or disposition period |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Asset sale or disposition investments |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000.0 |  |  |  |  |  |
Mandatory prepayment terms |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Bridge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 10,329,000 |  |
Bridge | Interest Expense. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | $ 10,300,000 |  |  |  |  |  |
Senior Secured Notes Due 2028 And Term B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |
Cap percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |
Senior Secured Notes Due 2028 And Term B Loan | Scenario, Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net leverage ratio |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  | 4.00% |  |  |
Senior Secured Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 800,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  | $ 373,300,000 |  |  |  |  |  |  |  | $ 20,800,000 |  | $ 900,000 | $ 394,100,000 |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
Percentage of notes issued on par value |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  | 100.00% |  |  |  | 100.00% |  |  |  | 90.00% |  | 92.00% |  |  |  |  |  |
Debt covenant, percentage of principal amount of notes outstanding |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | $ 15,000 |  |  |  | 0 |  |
Senior Secured Notes Due 2028 | Accrued Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Accrued Interest |  |  |  |  |  |  |  |  |  | $ 7,400,000 |  | $ 1,900,000 | $ 7,400,000 |  |  | 3,700,000 |  |
Senior Secured Notes Due 2028 | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  | 102.75% |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes Due 2028 | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  | 101.375% |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes Due 2028 | 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes Due 2028 | Prior to March 1,2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  | 105.50% |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes Due 2028 | Maximum | Prior to March 1,2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 850,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  | 7.05% |  |  |  |  |  |
Repayment of long-term debt | $ 100,000,000.0 |  |  | $ 396,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Ticking Fee, Term |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Ticking Fee, Percent |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |
Principal payment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,125,000 |  |  |  |
Debt Issuance Costs Write-off |  |  |  |  |  |  |  |  |  |  |  | $ 2,880,000 |  |  |  | $ 0 |  |
Term B Loan | LIBOR Floor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  | 0.75% |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
Term B Loan | Alternate Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan | Alternate Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |
Term B Loan | Eurocurrency Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term B Loan | Eurocurrency Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Term Loan B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  | $ 291,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payment |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Apr. 13, 2025 |  |  |  |  |  |  |  |  |
Prior Term Loan B | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  | base rate plus 2% |  |  |  |  |  |
Prior Term Loan B | Eurocurrency Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic spread rate |  |  |  |  |  |  |  | 3.00% |  |  |  | 3.00% |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  | LIBOR-equivalent rate plus 3% |  |  |  |  |  |
Prior Term Loan B | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  | 0.946% |  |  |  |  |  |  |  |  |  |
Derivative, Swaption Interest Rate |  |  |  |  |  |  |  |  |  |  |  | 3.946% |  |  |  |  |  |
Prior Term Loan B | Interest Rate Swap | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  |  |  |  | one-month LIBOR |  |  |  |  |  |  |  |  |  |
Prior Term Loan B | Interest Rate Swap | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Floor Interest Rate |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |

X
- Definition The period within which the cash proceeds from assets sale or disposition should be reinvested. + References No definition available. + Details
Name: | atge_AssetSaleOrDispositionPeriodForReinvestmentOfProceedsInAssets
Namespace Prefix: | atge_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of principal amount of notes outstanding related to debt covenant. + References No definition available. + Details
Name: | atge_DebtCovenantPercentageOfPrincipalAmountOfNotesOutstanding
Namespace Prefix: | atge_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of accrued interest on debt instrument for the period. + References No definition available. + Details
Name: | atge_DebtInstrumentAccruedInterest
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