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Percentage of Net Product and Engineering Revenue from Major Customers (Detail) (Sales Revenue, Net, Largest customers)
3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Concentration Risk [Line Items]    
Percentage of net product and engineering revenue 64.00% 62.00%
Philips
   
Concentration Risk [Line Items]    
Percentage of net product and engineering revenue 11.00% 17.00%
Siemens AG
   
Concentration Risk [Line Items]    
Percentage of net product and engineering revenue 13.00% 10.00%
Toshiba
   
Concentration Risk [Line Items]    
Percentage of net product and engineering revenue 13.00%    [1]
[1] Total net revenue was less than 10% in this period.