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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
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net income $ 4,910 $ 4,212
(Increase) decrease in —    
Inventories, net (68,946) (39,419)
Prepaid expenses and other assets (5,013) (872)
Increase (decrease) in —    
Accounts payable (11,294) (16,066)
Accrued expenses and long-term liabilities (2,093) $ (3,663)
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 4,447  
(Increase) decrease in —    
Inventories, net (69,154)  
Prepaid expenses and other assets (2,140)  
Increase (decrease) in —    
Accounts payable (11,431)  
Accrued expenses and long-term liabilities (4,158)  
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Net income 463  
(Increase) decrease in —    
Inventories, net 208  
Prepaid expenses and other assets (2,873)  
Increase (decrease) in —    
Accounts payable 137  
Accrued expenses and long-term liabilities $ 2,065