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Accounts Receivable (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 | Jul. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable | $ 135,884,000 | $ 70,461,000
Less allowance for doubtful accounts | 1,830,000 | 1,206,000
Accounts receivable, net | $ 134,054,000 | $ 69,255,000
Accounts Receivable | Major customer | U.S. government |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of total accounts receivable | 37.60% | 13.50%
Accounts Receivable | Major customer | U.S. Prime Contractor |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of total accounts receivable |  | 36.30%
Accounts Receivable | Major customer | Verizon Communications |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of total accounts receivable | 10.10% |
Billed Receivables | Commercial and International |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable | $ 60,670,000 | $ 39,062,000
Billed Receivables | U.S. government |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable | 29,086,000 | 8,375,000
Unbilled Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Retainage included in unbilled receivables | 118,000 | 0
Unbilled Receivables | Commercial and International |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable | 24,164,000 | 21,898,000
Unbilled Receivables | U.S. government |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total accounts receivable | 21,964,000 | 1,126,000
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 | $ 6,922,000 | $ 20,256,000

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