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Accounts Receivable (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Jul. 31, 2021
Statement [Line Items] |  |
Total accounts receivable | $ 140,402,000 | $ 159,758,000
Less allowance for doubtful accounts | 1,635,000 | 1,648,000
Accounts receivable, net | $ 138,767,000 | $ 158,110,000
Accounts Receivable | Customer Concentration Risk | U.S. government |  |
Statement [Line Items] |  |
Concentration risk, percentage | 21.70% | 23.00%
Accounts Receivable | Customer Concentration Risk | AT&T, Inc. |  |
Statement [Line Items] |  |
Concentration risk, percentage | 15.20% | 12.70%
Accounts Receivable | Customer Concentration Risk | Verizon |  |
Statement [Line Items] |  |
Concentration risk, percentage | 14.70% | 12.10%
Billed Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | $ 75,095,000 | $ 86,890,000
Billed Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | 29,079,000 | 33,381,000
Unbilled Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | 34,803,000 | 36,131,000
Unbilled Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | $ 1,425,000 | $ 3,356,000

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