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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jul. 31, 2015
Jul. 31, 2014
Property, Plant and Equipment [Abstract]    
Equipment $ 438,430 $ 438,899
Land and buildings 61,449 53,895
Computer software 130,340 116,775
Leasehold improvements 42,260 42,190
Furniture and fixtures 7,184 6,249
Property, plant and equipment, gross 679,663 658,008
Less accumulated depreciation and amortization (588,347) (576,248)
Property, plant and equipment, net $ 91,316 $ 81,760