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Income Taxes (Detail) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 | Mar. 31, 2020 USD ($) item | Mar. 31, 2019 | Jun. 30, 2019 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 4.30% | 18.40% | 9.60% | 19.50% |
Gain on cash flow hedge | $ 111.8 |  | $ 83.8 |  |
Number of operating units benefit from local tax incentives | item |  |  | 3 |  |
U.S. federal corporate tax rate |  |  | 21.00% |  | 21.00%
Minimum | Scenario, Plan [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  |  | $ 25.0
Maximum | Scenario, Plan [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  |  | $ 27.0

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