Inventories (Details) (USD $)	Oct. 31, 2013	Jul. 31, 2013
Inventory Disclosure [Abstract]
Raw materials and components	$ 53,572,000	$ 52,169,000
Work-in-process and finished goods	32,169,000	29,539,000
Total inventories	85,741,000	81,708,000
Less reserve for excess and obsolete inventories	16,709,000	16,226,000
Inventories, net	69,032,000	65,482,000
Inventory directly related to long-term contracts	1,543,000	1,910,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	$ 647,000	$ 592,000