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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Balance Sheet Line Items (Detail) - USD ($)
Jun. 30, 2019
Oct. 01, 2018
Sep. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net $ 434,729,000   $ 377,074,000
Prepaid expenses and other current assets 11,221,000   5,392,000
Accounts payable 31,601,000   23,134,000
Accrued expenses 37,359,000   32,926,000
Deferred tax liabilities 1,284,000    
Retained earnings 195,770,000   $ 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 435,032,000    
Prepaid expenses and other current assets 8,386,000    
Accounts payable 31,555,000    
Accrued expenses 35,563,000    
Deferred tax liabilities 1,147,000    
Retained earnings 195,217,000    
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]      
Inventories, net (303,000)    
Prepaid expenses and other current assets 2,835,000    
Accounts payable 46,000    
Accrued expenses 1,796,000    
Deferred tax liabilities 137,000    
Retained earnings $ 553,000 $ 399,000