Inventories (Details) - USD ($)	Oct. 31, 2022	Jul. 31, 2022
Inventory Disclosure [Abstract]
Raw materials and components	$ 81,288,000	$ 78,478,000
Work-in-process and finished goods	42,363,000	40,960,000
Total inventories	123,651,000	119,438,000
Less reserve for excess and obsolete inventories	23,903,000	23,121,000
Inventories, net	99,748,000	96,317,000
Inventory directly related to long-term contracts	4,537,000	4,100,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	$ 2,039,000	$ 1,866,000