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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |
Income tax benefit | $ 250,000 | $ 176,000 |
U.S. federal statutory tax rate | 21.00% | 21.00% |
Discrete tax benefit | $ 200,000 | $ 500,000 |
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate | 2,700,000 |  | $ 2,100,000
Undistributed earnings in foreign subsidiaries | $ 0 |  | $ 0

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