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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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