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Accounts Receivable (Details) - USD ($) | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
Statement [Line Items] |  |
Total accounts receivable | $ 159,758,000 | $ 128,585,000
Less: Allowance for doubtful accounts | 1,648,000 | 1,769,000
Accounts receivable, net | $ 158,110,000 | 126,816,000
Cumulative Effect, Period of Adoption, Adjustment |  |
Statement [Line Items] |  |
Less: Allowance for doubtful accounts |  | $ 215,000
U.S. Government and Its Agencies | Accounts Receivable | Customer Concentration Risk |  |
Statement [Line Items] |  |
Concentration risk, percentage | 23.00% | 31.00%
AT&T, Inc. | Accounts Receivable | Customer Concentration Risk |  |
Statement [Line Items] |  |
Concentration risk, percentage | 12.70% |
Verizon Communications Inc. | Accounts Receivable | Customer Concentration Risk |  |
Statement [Line Items] |  |
Concentration risk, percentage | 12.10% |
Billed Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | $ 86,890,000 | $ 67,109,000
Billed Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | 33,381,000 | 32,870,000
Unbilled Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | 36,131,000 | 21,588,000
Unbilled Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | $ 3,356,000 | $ 7,018,000

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