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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, 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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