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Income Taxes -Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate | 6.70% | 16.50% | (8.50%) | 4.90% |
Unrecognized tax benefits, uncertain tax positions | $ 7.1 |  | $ 7.1 |  | $ 5.8
Unrecognized tax benefits, accrued interest | $ 0.5 |  | $ 0.5 |  | $ 0.3

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