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Accounts Receivable (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jan. 31, 2022	Jul. 31, 2021
Statement [Line Items]
Total accounts receivable	$ 140,402,000	$ 159,758,000
Less allowance for doubtful accounts	1,635,000	1,648,000
Accounts receivable, net	$ 138,767,000	$ 158,110,000
Accounts Receivable | Customer Concentration Risk | U.S. government
Statement [Line Items]
Concentration risk, percentage	21.70%	23.00%
Accounts Receivable | Customer Concentration Risk | AT&T, Inc.
Statement [Line Items]
Concentration risk, percentage	15.20%	12.70%
Accounts Receivable | Customer Concentration Risk | Verizon
Statement [Line Items]
Concentration risk, percentage	14.70%	12.10%
Billed Receivables | Commercial and International Customers
Statement [Line Items]
Total accounts receivable	$ 75,095,000	$ 86,890,000
Billed Receivables | U.S. Government and Its Agencies
Statement [Line Items]
Total accounts receivable	29,079,000	33,381,000
Unbilled Receivables | Commercial and International Customers
Statement [Line Items]
Total accounts receivable	34,803,000	36,131,000
Unbilled Receivables | U.S. Government and Its Agencies
Statement [Line Items]
Total accounts receivable	$ 1,425,000	$ 3,356,000

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