Inventories (Details) - USD ($)	Jan. 31, 2023	Jul. 31, 2022
Inventory Disclosure [Abstract]
Raw materials and components	$ 82,469,000	$ 78,478,000
Work-in-process and finished goods	41,401,000	40,960,000
Total inventories	123,870,000	119,438,000
Less reserve for excess and obsolete inventories	23,740,000	23,121,000
Inventories, net	100,130,000	96,317,000
Inventory directly related to long-term contracts	5,492,000	4,100,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	$ 2,361,000	$ 1,866,000