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Accounts Receivable (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2023 | Jul. 31, 2024 | Jul. 31, 2023
Statement [Line Items] |  |  |
Total accounts receivable |  | $ 197,527,000 | $ 165,248,000
Less: Allowance for doubtful accounts |  | 1,932,000 | 2,089,000
Accounts receivable, net |  | $ 195,595,000 | $ 163,159,000
Accounts Receivable | Customer Concentration Risk | AT&T, Inc. |  |  |
Statement [Line Items] |  |  |
Concentration risk, percentage | 11.00% |  |
U.S. Government and Its Agencies | Accounts Receivable | Customer Concentration Risk |  |  |
Statement [Line Items] |  |  |
Concentration risk, percentage |  | 36.40% | 35.30%
Spectra Group (UK) | Accounts Receivable | Customer Concentration Risk |  |  |
Statement [Line Items] |  |  |
Concentration risk, percentage |  | 11.30% |
AT&T, Inc. | Accounts Receivable | Customer Concentration Risk |  |  |
Statement [Line Items] |  |  |
Concentration risk, percentage |  | 10.90% |
Billed Receivables | Commercial and International Customers |  |  |
Statement [Line Items] |  |  |
Total accounts receivable |  | $ 53,108,000 | $ 52,438,000
Billed Receivables | U.S. Government and Its Agencies |  |  |
Statement [Line Items] |  |  |
Total accounts receivable |  | 20,682,000 | 31,149,000
Unbilled Receivables |  |  |
Statement [Line Items] |  |  |
Long-term unbilled receivables |  | 824,000 | 2,993,000
Unbilled Receivables | Commercial and International Customers |  |  |
Statement [Line Items] |  |  |
Total accounts receivable |  | 72,540,000 | 54,469,000
Unbilled Receivables | U.S. Government and Its Agencies |  |  |
Statement [Line Items] |  |  |
Total accounts receivable |  | $ 51,197,000 | $ 27,192,000

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