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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Income Tax Contingency [Line Items] |  |  |  |
Undistributed Earnings of Foreign Subsidiaries | $ 74,500 |  |  |
Effective Income Tax Rate Reconciliation, Percent | 42.30% | 7.30% | 16.80% |
Income Tax Expense Benefit Special Items | $ 48,900 | $ 19,700 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 28.10% | 35.00% | 35.00% |
Transition Tax Expenses | $ 96,300 |  |  |
Effective Income Tax Rate Reconciliation Impact On Foreign Tax Rate | 10.50% |  |  |
Other Income Tax Expense Benefit Continuing Operations Tax Act | $ 103,900 |  |  |
Income Tax Deferred Taxes Impact Tax Act | 4,900 |  |  |
State Income And Foreign With holding Taxes Un distributed Foreign Earnings Tax Act | $ 2,700 |  |  |
Effective Income Tax Rate Continuing Operations Excluding Special Items | 19.10% | 16.00% |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 2,600 | $ 2,000 | $ 1,600 |
Income Tax Examination, Penalties and Interest Expense | 600 | 400 | 200 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 34,400 | 6,700 |  |
Deferred Tax Assets, Valuation Allowance | 11,496 | 9,456 | 8,624 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 314,000 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 58,100 |  |  |
Unrecognized Tax Benefits | 34,404 | $ 7,901 | $ 7,497 | $ 8,475
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 600 |  |  |
Adtalem Brazil [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income Tax Expense Benefit Special Items | $ 8,800 |  |  |
Minimum [Member] | Scenario, Plan [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 28.10% |  |  |

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