Accrued Expenses and Other Current Liabilities (Components) (Details) - USD ($)	Oct. 31, 2021	Jul. 31, 2021	Oct. 31, 2020	Jul. 31, 2020
Payables and Accruals [Abstract]
Accrued wages and benefits	$ 23,599,000	$ 26,367,000
Accrued contract costs	13,682,000	12,750,000
Accrued warranty obligations	16,889,000	17,600,000	$ 16,196,000	$ 15,200,000
Accrued legal costs	2,596,000	2,854,000
Accrued commissions and royalties	4,589,000	5,342,000
Accrued acquisition-related costs	8,969,000	9,222,000
Other	17,665,000	15,466,000
Accrued expenses and other current liabilities	$ 87,989,000	$ 89,601,000