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Accounts Receivable (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2022 | Jul. 31, 2022
Statement [Line Items] |  |
Total accounts receivable | $ 131,347,000 | $ 126,048,000
Less allowance for doubtful accounts | 2,560,000 | 2,337,000
Accounts receivable, net | $ 128,787,000 | $ 123,711,000
Accounts Receivable | Customer Concentration Risk | U.S. government |  |
Statement [Line Items] |  |
Concentration risk, percentage | 20.80% | 20.90%
Accounts Receivable | Customer Concentration Risk | Verizon |  |
Statement [Line Items] |  |
Concentration risk, percentage | 18.30% | 13.40%
Accounts Receivable | Customer Concentration Risk | AT&T, Inc. |  |
Statement [Line Items] |  |
Concentration risk, percentage | 11.30% |
Billed Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | $ 58,863,000 | $ 59,922,000
Billed Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | 22,427,000 | 24,776,000
Unbilled Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | 45,109,000 | 39,826,000
Unbilled Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | $ 4,948,000 | $ 1,524,000

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