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Income Taxes (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 USD ($) | Dec. 31, 2020 item | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 18.60% | 85.30% | 19.50% | 37.60%
Number of operating units benefit from local tax incentives | item |  |  | 3 |
U.S. federal corporate tax rate |  |  | 21.00% | 21.00%
Discontinued Operations, Disposed of by Sale | Adtalem Educational Do Brazil [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Loss on cash flow hedge | $ |  | $ 28.0 |  |

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