Inventories (Details) (USD $)	Jul. 31, 2011	Jul. 31, 2010
Raw materials and components	$ 53,678,000	$ 55,380,000
Work-in-process and finished goods	34,299,000	31,973,000
Total Inventories	87,977,000	87,353,000
Less reserve for excess and obsolete inventories	13,316,000	13,791,000
Inventories, net	74,661,000	73,562,000
Inventory directly related to long-term contracts	8,041,000	12,063,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	1,339,000	1,976,000
BFT-1 Program [Member]
Inventory directly related to long-term contracts	$ 1,411,000