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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, 2019
Oct. 01, 2018
Sep. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net $ 477,468,000   $ 377,074,000
Prepaid expenses and other current assets 10,206,000   5,392,000
Accounts payable 33,674,000   23,134,000
Accrued expenses 42,849,000   32,926,000
Deferred tax liabilities 1,142,000    
Retained earnings 202,455,000   $ 166,071,000
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