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Accounts Receivable (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Statement [Line Items]
Total accounts receivable	$ 159,758,000	$ 128,585,000
Less: Allowance for doubtful accounts	1,648,000	1,769,000
Accounts receivable, net	$ 158,110,000	126,816,000
Cumulative Effect, Period of Adoption, Adjustment
Statement [Line Items]
Less: Allowance for doubtful accounts		$ 215,000
U.S. Government and Its Agencies | Accounts Receivable | Customer Concentration Risk
Statement [Line Items]
Concentration risk, percentage	23.00%	31.00%
AT&T, Inc. | Accounts Receivable | Customer Concentration Risk
Statement [Line Items]
Concentration risk, percentage	12.70%
Verizon Communications Inc. | Accounts Receivable | Customer Concentration Risk
Statement [Line Items]
Concentration risk, percentage	12.10%
Billed Receivables | Commercial and International Customers
Statement [Line Items]
Total accounts receivable	$ 86,890,000	$ 67,109,000
Billed Receivables | U.S. Government and Its Agencies
Statement [Line Items]
Total accounts receivable	33,381,000	32,870,000
Unbilled Receivables | Commercial and International Customers
Statement [Line Items]
Total accounts receivable	36,131,000	21,588,000
Unbilled Receivables | U.S. Government and Its Agencies
Statement [Line Items]
Total accounts receivable	$ 3,356,000	$ 7,018,000

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