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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
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