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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total | 202.00% |  |  |  | 141.20% |  |
Income Tax Expense Benefit Special Items |  |  | $ 10.1 |  |  | $ 10.1 |
Effective Income Tax Rate Excluding Special Items |  |  | 362.00% |  |  | (7.60%) |
Effective Income Tax Rate Excluding Settlements |  |  | 19.40% |  |  | 20.80% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 35.00% |  |
Transition Tax Expenses | $ 96.3 |  |  |  | $ 96.3 |  |
Effective Income Tax Rate Reconciliation Impact On Foreign Tax Rate |  |  |  |  | 10.50% |  |
Other Income Tax Expense (Benefit), Continuing Operations | $ 109.6 |  |  |  |  |  |
Effective Income Tax Rate Excluding Tax Act | 15.60% |  |  |  | 15.00% |  |
Other Income Tax Expense Benefit Continuing Operations Tax Act | $ 101.2 |  |  |  | $ 101.2 |  |
Income Tax Deferred Taxes Impact Tax Act | 2.5 |  |  |  | 2.5 |  |
State Income And Foreign With holding Taxes Un distributed Foreign Earnings Tax Act | 2.7 |  |  |  | 2.7 |  |
Income Tax Expense Benefit Tax Act Adjustment |  | $ 0.3 |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% |  |  |
Adtalem Brazil [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries | $ 91.0 |  |  |  | $ 91.0 |  |
Minimum [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  | 28.10%

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