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Property and Equipment, Net - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Property and Equipment [Abstract]      
Depreciation expense $ 105,439 $ 105,027 $ 113,717
Unamortized software assets $ 152,366 $ 127,080