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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
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Net income | $ 35,985 | $ 39,312 | $ 23,547
(Increase) decrease in — |  |  |
Inventories, net | (84,330) | 26,773 | (57,107)
Prepaid expenses and other assets | (3,182) | (996) | (1,710)
Increase (decrease) in — |  |  |
Accounts payable | 8,701 | $ (3,325) | $ 16,835
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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