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Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Regulatory Assets [Abstract]      
Liquid investments maximum maturity Three months or less    
Inventories market valuation allowance $ 1,800,000 $ 2,800,000  
Goodwill 802,000    
Impairment charges 0    
Total advertising and promotional expenses 9,800,000 9,500,000 11,200,000
Net of related co-op assistance $ 419,000 $ 390,000 $ 364,000