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Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Accounting Policies [Abstract]      
Inventories market valuation allowance $ 1,800,000 $ 2,200,000  
Goodwill 802,000    
Impairment charges 0    
Total advertising and promotional expenses 10,500,000 9,500,000 $ 9,800,000
Net of related co-op assistance $ 737,000 $ 473,000 $ 419,000