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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Balance Sheet Line Items (Detail) - USD ($)
Mar. 31, 2019
Oct. 01, 2018
Sep. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net $ 454,557,000   $ 377,074,000
Prepaid expenses and other current assets 8,839,000   5,392,000
Deferred tax assets, net 1,767,000   3,408,000
Accounts payable 11,626,000   23,134,000
Accrued expenses 37,098,000   32,926,000
Retained earnings 176,683,000   $ 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 454,607,000    
Prepaid expenses and other current assets 5,722,000    
Deferred tax assets, net 1,904,000    
Accounts payable 11,626,000    
Accrued expenses 34,567,000    
Retained earnings 176,284,000    
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net (50,000)    
Prepaid expenses and other current assets 3,117,000    
Deferred tax assets, net (137,000)    
Accrued expenses 2,531,000    
Retained earnings $ 399,000 $ 399,000