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Equipment and Leasehold Improvements, Net - Components of Equipment and Leasehold Improvements, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, gross $ 1,275,540 $ 1,394,821
Less accumulated depreciation (943,812) (1,085,501)
Equipment and leasehold improvements, net 331,728 309,320
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, gross 1,016,973 1,132,152
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, gross 206,195 201,765
Furniture, Fixtures and Other [Member]    
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, gross $ 52,372 $ 60,904