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Accounts Receivable (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2024 | Jan. 31, 2025 | Jul. 31, 2024
Statement [Line Items] |  |  |
Total accounts receivable |  | $ 186,990,000 | $ 197,527,000
Less allowance for doubtful accounts |  | 19,793,000 | 1,932,000
Accounts receivable, net |  | 167,197,000 | 195,595,000
Unbilled receivables, not billable |  | 18,993,000 |
Cumulative earnings (deficit) |  | (1,551,000) |
Accounts Receivable |  |  |
Statement [Line Items] |  |  |
Unbilled receivables, not billable |  | 17,442,000 |
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 |  | 1,585,000 |
Cumulative earnings (deficit) |  | $ 1,752,000 |
Accounts Receivable | Customer Concentration Risk | U.S. government |  |  |
Statement [Line Items] |  |  |
Concentration risk, percentage | 36.40% | 34.60% |
Accounts Receivable | Customer Concentration Risk | AT&T, Inc. |  |  |
Statement [Line Items] |  |  |
Concentration risk, percentage | 10.90% |  |
Accounts Receivable | Customer Concentration Risk | U.K. |  |  |
Statement [Line Items] |  |  |
Concentration risk, percentage | 11.30% | 13.30% |
Billed Receivables | Commercial and International Customers |  |  |
Statement [Line Items] |  |  |
Total accounts receivable |  | $ 58,599,000 | 53,108,000
Billed Receivables | U.S. Government and Its Agencies |  |  |
Statement [Line Items] |  |  |
Total accounts receivable |  | 42,259,000 | 20,682,000
Unbilled Receivables |  |  |
Statement [Line Items] |  |  |
Long-term receivables |  |  | 824,000
Unbilled Receivables | Commercial and International Customers |  |  |
Statement [Line Items] |  |  |
Total accounts receivable |  | 63,679,000 | 72,540,000
Unbilled Receivables | U.S. Government and Its Agencies |  |  |
Statement [Line Items] |  |  |
Total accounts receivable |  | $ 22,453,000 | $ 51,197,000

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