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Equipment and Leasehold Improvements, Net - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 105,027 $ 113,717 $ 108,169
Unamortized software assets $ 127,080 $ 104,346