Inventories (Details) - USD ($)	Oct. 31, 2023	Jul. 31, 2023
Inventory Disclosure [Abstract]
Raw materials and components	$ 75,591,000	$ 87,139,000
Work-in-process and finished goods	26,749,000	43,365,000
Total inventories	102,340,000	130,504,000
Less reserve for excess and obsolete inventories	16,900,000	24,659,000
Inventories, net	85,440,000	105,845,000
Inventory directly related to long-term contracts	4,575,000	5,911,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	$ 2,707,000	$ 3,277,000