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Inventories (Details) (USD $)
Jan. 31, 2014
Jul. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials and components $ 55,791,000 $ 52,169,000
Work-in-process and finished goods 30,030,000 29,539,000
Total inventories 85,821,000 81,708,000
Less reserve for excess and obsolete inventories 15,726,000 16,226,000
Inventories, net 70,095,000 65,482,000
Inventory directly related to long-term contracts 1,370,000 1,910,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us $ 617,000 $ 592,000