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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Balance Sheet Line Items (Detail) - USD ($) | Jun. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Inventories, net | $ 434,729,000 |  | $ 377,074,000
Prepaid expenses and other current assets | 11,221,000 |  | 5,392,000
Accounts payable | 31,601,000 |  | 23,134,000
Accrued expenses | 37,359,000 |  | 32,926,000
Deferred tax liabilities | 1,284,000 |  |
Retained earnings | 195,770,000 |  | $ 166,071,000
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Inventories, net | 435,032,000 |  |
Prepaid expenses and other current assets | 8,386,000 |  |
Accounts payable | 31,555,000 |  |
Accrued expenses | 35,563,000 |  |
Deferred tax liabilities | 1,147,000 |  |
Retained earnings | 195,217,000 |  |
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Inventories, net | (303,000) |  |
Prepaid expenses and other current assets | 2,835,000 |  |
Accounts payable | 46,000 |  |
Accrued expenses | 1,796,000 |  |
Deferred tax liabilities | 137,000 |  |
Retained earnings | $ 553,000 | $ 399,000 |

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