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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Net income | $ 74,634 | $ 35,985 | $ 39,312
(Increase) decrease in — |  |  |
Inventories, net | 179,466 | (84,330) | 26,773
Prepaid expenses and other assets | 101 | (3,182) | (996)
Increase (decrease) in — |  |  |
Accounts payable | $ 2,887 | 8,701 | $ (3,325)
Accrued expenses and other long-term liabilities |  | 4,731 |
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Net income |  | 36,079 |
(Increase) decrease in — |  |  |
Inventories, net |  | (83,712) |
Prepaid expenses and other assets |  | (1,748) |
Increase (decrease) in — |  |  |
Accounts payable |  | 8,735 |
Accrued expenses and other long-term liabilities |  | 2,551 |
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Net income |  | (94) |
(Increase) decrease in — |  |  |
Inventories, net |  | (618) |
Prepaid expenses and other assets |  | (1,434) |
Increase (decrease) in — |  |  |
Accounts payable |  | (34) |
Accrued expenses and other long-term liabilities |  | $ 2,180 |

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