Inventories (Details) (USD $)	Jan. 31, 2012	Jul. 31, 2011
Raw materials and components	$ 56,919,000	$ 53,678,000
Work-in-process and finished goods	33,460,000	34,299,000
Total Inventories	90,379,000	87,977,000
Less reserve for excess and obsolete inventories	15,172,000	13,316,000
Inventories, net	75,207,000	74,661,000
Inventory directly related to long-term contracts	2,871,000	8,041,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	1,043,000	1,339,000
BFT-1 Program [Member]
Inventory directly related to long-term contracts	$ 320,000