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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

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