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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% |  |  |  |  |  |

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