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Commitments and Contingencies - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]      
Rental expenses of operating leases $ 8,900,000 $ 8,400,000 $ 8,300,000
Costs incurred for store closings and lease terminations 3,100,000 $ 0 $ 88,000
Workers compensation insurance policies $ 1,300,000