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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Jul. 31, 2011
Inventories [Abstract]    
Raw material and component parts $ 8,670 $ 6,205
Work in progress 1,663 1,172
Finished goods 5,346 4,705
Inventories $ 15,679 $ 12,082