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Equipment and Leasehold Improvements, Net - Components of Equipment and Leasehold Improvements, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, gross $ 1,394,821 $ 1,328,798
Less accumulated depreciation (1,085,501) (1,039,842)
Equipment and leasehold improvements, net 309,320 288,956
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, gross 1,132,152 1,071,720
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, gross 201,765 192,007
Furniture, Fixtures and Other [Member]    
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, gross $ 60,904 $ 65,071