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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Balance Sheet Line Items (Detail) - USD ($)
Sep. 30, 2020
Sep. 30, 2019
Oct. 01, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net $ 298,002,000 $ 477,468,000  
Prepaid expenses and other current assets 9,637,000 10,206,000  
Accounts payable 37,343,000 33,674,000  
Accrued expenses 52,123,000 42,849,000  
Deferred tax liabilities 4,509,000 1,142,000  
Retained earnings $ 277,699,000 202,455,000  
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net   477,405,000  
Prepaid expenses and other current assets   7,681,000  
Accounts payable   33,708,000  
Accrued expenses   40,669,000  
Deferred tax liabilities   1,005,000  
Retained earnings   202,150,000  
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net   63,000  
Prepaid expenses and other current assets   2,525,000  
Accounts payable   (34,000)  
Accrued expenses   2,180,000  
Deferred tax liabilities   137,000  
Retained earnings   $ 305,000 $ 399,000