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Accounts Receivable (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2026 | Jul. 31, 2025
Statement [Line Items] |  |
Total accounts receivable | $ 145,886,000 | $ 163,993,000
Less allowance for doubtful accounts | 18,091,000 | 19,156,000
Accounts receivable, net | 127,795,000 | $ 144,837,000
U.S. Marine Corps |  |
Statement [Line Items] |  |
Accounts receivable, net | $ 10,543,000 |
Accounts Receivable | Customer Concentration Risk | U.S. government |  |
Statement [Line Items] |  |
Concentration risk, percentage | 26.40% | 25.10%
Accounts Receivable | Customer Concentration Risk | Top Tier Mobile Network 1 |  |
Statement [Line Items] |  |
Concentration risk, percentage |  | 14.50%
Accounts Receivable | Customer Concentration Risk | Top Tier Mobile Network 2 |  |
Statement [Line Items] |  |
Concentration risk, percentage | 10.00% | 10.50%
Billed Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | $ 57,775,000 | $ 57,713,000
Billed Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | 9,418,000 | 15,610,000
Unbilled Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | 54,368,000 | 69,987,000
Unbilled Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | $ 24,325,000 | $ 20,683,000

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