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Accounts Receivable (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2024 | Jul. 31, 2023
Statement [Line Items] |  |
Total accounts receivable | $ 202,352,000 | $ 165,248,000
Less allowance for doubtful accounts | 2,706,000 | 2,089,000
Accounts receivable, net | $ 199,646,000 | $ 163,159,000
Accounts Receivable | Customer Concentration Risk | U.S. government |  |
Statement [Line Items] |  |
Concentration risk, percentage | 42.30% | 35.30%
Accounts Receivable | Customer Concentration Risk | AT&T, Inc. |  |
Statement [Line Items] |  |
Concentration risk, percentage |  | 11.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-05-01 |  |
Statement [Line Items] |  |
Remaining performance obligations, period | 24 months |
Billed Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | $ 39,770,000 | $ 52,438,000
Billed Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | 21,316,000 | 31,149,000
Unbilled Receivables |  |
Statement [Line Items] |  |
Long-term receivables | 417,000 | 2,993,000
Unbilled Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | 76,932,000 | 54,469,000
Unbilled Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | $ 64,334,000 | $ 27,192,000

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