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Accounts Receivable (Details) (USD $)
 6 Months Ended
Jan. 31, 2014
Jul. 31, 2013
Jan. 31, 2014
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Jan. 31, 2014
Billed Receivables [Member]
Commercial Customers [Member]
Jul. 31, 2013
Billed Receivables [Member]
Commercial Customers [Member]
Jan. 31, 2014
Billed Receivables [Member]
U.S. Government and Its Agencies [Member]
Jul. 31, 2013
Billed Receivables [Member]
U.S. Government and Its Agencies [Member]
Jan. 31, 2014
Unbilled Receivables on Contracts-In-Progress [Member]
Jul. 31, 2013
Unbilled Receivables on Contracts-In-Progress [Member]
Total accounts receivable $ 57,574,000 $ 50,518,000   $ 36,018,000 $ 40,005,000 $ 8,757,000 $ 8,114,000 $ 12,799,000 $ 2,399,000
Less allowance for doubtful accounts 695,000 603,000              
Accounts receivable, net 56,879,000 49,915,000              
Unbilled receivables on contracts-in-progress due from U.S. government and its agencies 1,334,000 699,000              
Retainage included in unbilled receivables $ 0 $ 0              
Percentage of total accounts receivable from the prime contractor that we perform work for on our two North African country end-customer contracts     17.90%