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Commitments and Contingencies - Additional Information (Detail) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]      
Rental expenses of operating leases $ 5,800,000 $ 5,400,000 $ 5,100,000
Recovery of direct costs 555,000 11,700,000  
Costs incurred for store closings and lease terminations 217,000 162,000 350,000
Workers compensation insurance policies $ 1,300,000