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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 0.2 | $ 1.5 | $ 8.9 | $ 6.0 |
Effective income tax rate, percent | 1.90% | 17.90% | 19.30% | 20.30% |
Deferred Tax Assets, Net Of Deferred Tax Liabilities | $ 3.2 |  | $ 3.2 |  | $ 20.7
Valuation allowance, deferred tax asset, amount | 3.3 |  | 3.3 |  | $ 3.3
Unrecognized Tax Benefits, Period Increase (Decrease) | 1.6 |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 2.3 |  | 2.3 |  |
Deferred Tax Liabilities, Other | $ 0.1 |  | $ 0.1 |  |

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