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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
 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net income $ 10,213 $ 10,396
(Increase) decrease in —    
Inventories, net (78,038) (20,129)
Prepaid expenses and other assets (3,109) 602
Increase (decrease) in —    
Accounts payable (11,508) (8,545)
Accrued expenses and long-term liabilities 5,389 $ 470
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 10,213  
(Increase) decrease in —    
Inventories, net (77,533)  
Prepaid expenses and other assets (1,083)  
Increase (decrease) in —    
Accounts payable (11,508)  
Accrued expenses and long-term liabilities 2,858  
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]    
(Increase) decrease in —    
Inventories, net (505)  
Prepaid expenses and other assets (2,026)  
Increase (decrease) in —    
Accrued expenses and long-term liabilities $ 2,531