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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 | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net income | $ 29,300 | $ 27,772
(Increase) decrease in — |  |
Inventories, net | (41,591) | 24,386
Prepaid expenses and other assets | (5,777) | (417)
Increase (decrease) in — |  |
Accounts payable | 7,909 | (5,686)
Accrued expenses and other long-term liabilities | 5,167 | $ 4,636
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 | 29,146 |
(Increase) decrease in — |  |
Inventories, net | (41,339) |
Prepaid expenses and other assets | (4,033) |
Increase (decrease) in — |  |
Accounts payable | 7,863 |
Accrued expenses and other long-term liabilities | 3,371 |
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net income | 154 |
(Increase) decrease in — |  |
Inventories, net | (252) |
Prepaid expenses and other assets | (1,744) |
Increase (decrease) in — |  |
Accounts payable | 46 |
Accrued expenses and other long-term liabilities | $ 1,796 |

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