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Goodwill - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Schedule Of Goodwill And Other Assets [Line Items]            
Accounts receivable, net   $ 54,489,000   $ 54,489,000   $ 40,195,000
Inventories, net   302,979,000   302,979,000   298,002,000
Short-term borrowings   35,762,000   35,762,000   144,393,000
Accrued expenses   84,536,000   84,536,000   52,123,000
Customer deposits   83,357,000   83,357,000   31,821,000
Revenue   523,095,000 $ 308,475,000 934,618,000 $ 612,647,000  
Estimated income before taxes   51,778,000 $ 6,703,000 82,493,000 $ 18,991,000  
Goodwill and other intangible assets, net   $ 142,152,000   142,152,000   $ 84,293,000
SkipperBuds [Member]            
Schedule Of Goodwill And Other Assets [Line Items]            
Aggregate purchase price $ 55,000,000          
Maximum amount of consideration paid under earnout 9,300,000          
Fair value of contingent consideration 8,200,000          
Accounts receivable, net 5,400,000          
Inventories, net 42,300,000          
Short-term borrowings 30,500,000          
Accrued expenses 14,600,000          
Customer deposits 7,500,000          
Goodwill 56,363,000          
Other identifiable intangibles $ 2,000,000.0          
Intangible assets, weighted average useful life 3 years 3 months 18 days          
Revenue       108,400,000    
Estimated income before taxes       $ 7,900,000