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Commitments and Contingencies - Additional Information (Detail) (USD $)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Commitments And Contingencies Disclosure [Abstract]      
Rental expenses of operating leases $ 5,400,000 $ 5,100,000 $ 6,100,000
Recovery of direct costs 11,800,000    
Costs incurred for store closings and lease terminations 162,000 350,000 750,000
Workers compensation insurance policies $ 800,000