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Income Taxes (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 | Jun. 30, 2019 | Jun. 30, 2018
Income Taxes - Additional Information [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 28.10%
Provisional tax expense for the deemed repatriation of undistributed foreign earnings, Increase (decrease) | $ 1.0 |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 81.9 |  |  |
Estimated cash payment related to provisional tax expense for the deemed repatriation of undistributed foreign earnings | $ 4.5 |  |  |
Estimated cash payment related to provisional tax expense for the deemed repatriation of undistributed foreign earnings, payment term, years | 8 |  |  |
Income Tax (Textual) [Abstract] |  |  |  |
Effective tax rate | 24.90% | 19.50% |  |
Scenario, Forecast [Member] |  |  |  |
Income Taxes - Additional Information [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |

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