Inventories (Details) (USD $)	Oct. 31, 2012	Jul. 31, 2012
Inventory Disclosure [Abstract]
Raw materials and components	$ 53,585,000	$ 55,404,000
Work-in-process and finished goods	29,730,000	33,243,000
Total inventories	83,315,000	88,647,000
Less reserve for excess and obsolete inventories	14,667,000	16,286,000
Inventories, net	68,648,000	72,361,000
Inventory directly related to long-term contracts	1,265,000	2,041,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	$ 682,000	$ 1,070,000