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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, 2020
Sep. 30, 2019
Sep. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Net income $ 74,634 $ 35,985 $ 39,312
(Increase) decrease in —      
Inventories, net 179,466 (84,330) 26,773
Prepaid expenses and other assets 101 (3,182) (996)
Increase (decrease) in —      
Accounts payable $ 2,887 8,701 $ (3,325)
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