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Customer and Geographic Information (Details) (USD $)
3 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Major customer
       
Revenues from External Customers        
Percentage of revenue generated from external customer type 13.50%   13.00%  
Minimum percentage of consolidated net sales sold to one customer or individual country requiring additional and separate disclosure 10.00% 10.00% 10.00% 10.00%
U.S. government
       
Revenues from External Customers        
Percentage of revenue generated from external customer type 31.20% 32.80% 28.40% 38.60%
U.S. government | Excluding Mobile Data Communications segment
       
Revenues from External Customers        
Percentage of revenue generated from external customer type 25.70% 25.80% 23.20% 31.50%
Commercial (United States)
       
Revenues from External Customers        
Percentage of revenue generated from external customer type 11.30% 12.90% 14.30% 13.30%
Total United States
       
Revenues from External Customers        
Percentage of revenue generated from external customer type 42.50% 45.70% 42.70% 51.90%
North African country
       
Revenues from External Customers        
Percentage of revenue generated from external customer type 13.70% 8.20% 13.10% 5.00%
Other international
       
Revenues from External Customers        
Percentage of revenue generated from external customer type 43.80% 46.10% 44.20% 43.10%
Total International
       
Revenues from External Customers        
Percentage of revenue generated from external customer type 57.50% 54.30% 57.30% 48.10%
Revenue generated from external customers $ 49,144,000 $ 40,471,000 $ 96,684,000 $ 79,689,000