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Accounts Receivable (Details) - USD ($)	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Statement [Line Items]
Total accounts receivable	$ 165,248,000	$ 126,048,000
Less: Allowance for doubtful accounts	2,089,000	2,337,000
Accounts receivable, net	$ 163,159,000	$ 123,711,000
U.S. Government and Its Agencies | Accounts Receivable | Customer Concentration Risk
Statement [Line Items]
Concentration risk, percentage	35.30%	20.90%
AT&T, Inc. | Accounts Receivable | Customer Concentration Risk
Statement [Line Items]
Concentration risk, percentage	11.00%
Verizon Communications Inc. | Accounts Receivable | Customer Concentration Risk
Statement [Line Items]
Concentration risk, percentage		13.40%
Billed Receivables | Commercial and International Customers
Statement [Line Items]
Total accounts receivable	$ 52,438,000	$ 59,922,000
Billed Receivables | U.S. Government and Its Agencies
Statement [Line Items]
Total accounts receivable	31,149,000	24,776,000
Unbilled Receivables
Statement [Line Items]
Long-term unbilled receivables	2,993,000
Unbilled Receivables | Commercial and International Customers
Statement [Line Items]
Total accounts receivable	54,469,000	39,826,000
Unbilled Receivables | U.S. Government and Its Agencies
Statement [Line Items]
Total accounts receivable	$ 27,192,000	$ 1,524,000

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