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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
New Accounting Pronouncements Or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred income taxes |  | $ (17,891) | $ 20,515 | $ 9,513 |
Income tax (benefit) expense |  | (17,426) | 20,874 | $ 9,926 |
Correction of prior period adjustment to increase retained earnings |  |  |  |  | $ 2,300
Restricted cash |  | $ 3,823 | $ 3,559 |  |
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 |  |  |  |
Correction of prior period adjustment to increase retained earnings | $ 700 |  |  |  |

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