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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Balance Sheet Line Items (Detail) - USD ($) | Sep. 30, 2020 | Sep. 30, 2019 | Oct. 01, 2018
--- | --- | --- | ---
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Inventories, net | $ 298,002,000 | $ 477,468,000 |
Prepaid expenses and other current assets | 9,637,000 | 10,206,000 |
Accounts payable | 37,343,000 | 33,674,000 |
Accrued expenses | 52,123,000 | 42,849,000 |
Deferred tax liabilities | 4,509,000 | 1,142,000 |
Retained earnings | $ 277,699,000 | 202,455,000 |
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 |  | 477,405,000 |
Prepaid expenses and other current assets |  | 7,681,000 |
Accounts payable |  | 33,708,000 |
Accrued expenses |  | 40,669,000 |
Deferred tax liabilities |  | 1,005,000 |
Retained earnings |  | 202,150,000 |
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Inventories, net |  | 63,000 |
Prepaid expenses and other current assets |  | 2,525,000 |
Accounts payable |  | (34,000) |
Accrued expenses |  | 2,180,000 |
Deferred tax liabilities |  | 137,000 |
Retained earnings |  | $ 305,000 | $ 399,000

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