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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018
New Accounting Pronouncements Or Change in Accounting Principle [Line Items] |  |  |  |  |
Income tax (benefit) expense | $ 4,086 | $ 608 |  | $ 10,035 | $ (21,181)
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
New Accounting Pronouncements Or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred income taxes |  |  | $ 400 |  |
Income tax (benefit) expense |  |  | 300 |  |
Cumulative-effect adjustment increasing retained earnings |  |  | $ 700 |  |

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