Inventories (Details) (USD $)	Jan. 31, 2013	Jul. 31, 2012
Inventory Disclosure [Abstract]
Raw materials and components	$ 54,964,000	$ 55,404,000
Work-in-process and finished goods	30,350,000	33,243,000
Total inventories	85,314,000	88,647,000
Less reserve for excess and obsolete inventories	15,158,000	16,286,000
Inventories, net	70,156,000	72,361,000
Inventory directly related to long-term contracts	1,543,000	2,041,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	$ 552,000	$ 1,070,000