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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Commitments And Contingencies Disclosure [Abstract]      
Rental expenses of operating leases $ 7,100 $ 6,000 $ 5,800
Recovery of direct costs     555
Costs incurred for store closings and lease terminations 0 $ 581 $ 217
Workers compensation insurance policies $ 1,000