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Accounts Receivable (Details)
 6 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
contract
Jul. 31, 2016
USD ($)
contract
customer
Jan. 31, 2017
USD ($)
contract
Jul. 31, 2016
USD ($)
contract
customer
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total accounts receivable $ 127,007,000 $ 151,996,000 $ 127,007,000 $ 151,996,000
Less allowance for doubtful accounts 1,462,000 1,029,000 1,462,000 1,029,000
Accounts receivable, net $ 125,545,000 $ 150,967,000 $ 125,545,000 $ 150,967,000
Accounts Receivable | Major customer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of customers accounted for greater than 10% of total accounts receivable | customer   0   0
Minimum percentage of total accounts receivable outstanding by one customer or individual country requiring additional and separate disclosure 10.00% 10.00% 10.00% 10.00%
Accounts Receivable | Major customer | U.S. government and its agencies        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage of total accounts receivable 24.10% 27.90%    
Accounts Receivable | Major customer | Verizon Communications Inc.        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage of total accounts receivable 11.70%      
Accounts Receivable | Major customer | North African country end customers        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage of total accounts receivable     11.80% 10.50%
Billed Receivables | Commercial and International        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total accounts receivable $ 73,002,000 $ 90,185,000 $ 73,002,000 $ 90,185,000
Billed Receivables | U.S. government and its agencies        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total accounts receivable 16,958,000 21,465,000 16,958,000 21,465,000
Unbilled Receivables        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Retainage included in unbilled receivables 118,000 118,000 118,000 118,000
Unbilled Receivables | Commercial and International        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total accounts receivable 23,405,000 19,333,000 23,405,000 19,333,000
Unbilled Receivables | U.S. government and its agencies        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total accounts receivable 13,642,000 21,013,000 13,642,000 21,013,000
Unbilled Receivables | Major customer | U.S. Prime Contractor        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unbilled receivable related to our large over-the-horizon microwave system contracts $ 3,860,000 $ 6,070,000 $ 3,860,000 $ 6,070,000
Number of large over-the-horizon microwave system contracts | contract 1 1 1 1