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v3.25.1

Accounts Receivable (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2025 | Jul. 31, 2024
Statement [Line Items] |  |
Total accounts receivable | $ 170,988,000 | $ 197,527,000
Less allowance for doubtful accounts | 19,516,000 | 1,932,000
Accounts receivable, net | 151,472,000 | $ 195,595,000
Unbilled receivables, not billable | 18,557,000 |
Cumulative earnings (deficit) | (1,551,000) |
Accounts Receivable |  |
Statement [Line Items] |  |
Unbilled receivables, not billable | 17,006,000 |
Modular Transportable Transmission Systems |  |
Statement [Line Items] |  |
Cumulative earnings (deficit) | 1,004,000 |
CGC Divestiture |  |
Statement [Line Items] |  |
Unbilled receivables, not billable | 3,003,000 |
Cumulative earnings (deficit) | 4,157,000 |
Nonrecurring Engineering Projects |  |
Statement [Line Items] |  |
Unbilled receivables, not billable | 2,187,000 |
Cumulative earnings (deficit) | $ 2,376,000 |
Accounts Receivable | Customer Concentration Risk | U.S. government |  |
Statement [Line Items] |  |
Concentration risk, percentage | 24.00% | 36.40%
Accounts Receivable | Customer Concentration Risk | AT&T, Inc. |  |
Statement [Line Items] |  |
Concentration risk, percentage | 11.20% | 10.90%
Accounts Receivable | Customer Concentration Risk | U.K. |  |
Statement [Line Items] |  |
Concentration risk, percentage | 11.70% | 11.30%
Billed Receivables | U.S. Marine Corps |  |
Statement [Line Items] |  |
Total accounts receivable | $ 13,904,000 |
Billed Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | 59,936,000 | $ 53,108,000
Billed Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | 21,110,000 | 20,682,000
Unbilled Receivables |  |
Statement [Line Items] |  |
Long-term receivables |  | 824,000
Unbilled Receivables | U.S. Marine Corps |  |
Statement [Line Items] |  |
Total accounts receivable | 13,904,000 |
Unbilled Receivables | Commercial and International Customers |  |
Statement [Line Items] |  |
Total accounts receivable | 70,030,000 | 72,540,000
Unbilled Receivables | U.S. Government and Its Agencies |  |
Statement [Line Items] |  |
Total accounts receivable | $ 19,912,000 | $ 51,197,000

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