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Property, Plant and Equipment (Tables)
12 Months Ended
Jul. 31, 2015
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment

July 31
(in thousands)
 2015  2014 
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 
   679,663   658,008 
Less accumulated depreciation and amortization  (588,347)  (576,248)
Property, plant and equipment, net $91,316  $81,760