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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 13.0 | $ 5.2 | $ 41.4 | $ 21.5 |
Effective income tax rate, percent | 24.70% | 24.60% | 24.40% | 24.50% |
Deferred Income Tax Liabilities, Net of Deferred Income Tax Assets | $ 24.5 |  | $ 24.5 |  | $ 23.2
Valuation allowance, deferred tax asset, amount | 1.1 |  | 1.1 |  | 1.2
Deferred tax liability, net | $ 25.6 |  | $ 25.6 |  | $ 24.4

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