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Acquisition Assets acquired (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Nov. 02, 2013
Jul. 31, 2013
Business Acquisition        
Consideration transferred, Cash $ 12,505 $ 0    
Consideration transferred, Contingent consideration     500  
Fair value of total consideration transferred 13,005      
Recognized amounts of identifiable assets acquired, Inventories     664  
Recognized amounts of identifiable assets acquired, Current assets     630  
Recognized amounts of identifiable assets acquired, Deferred taxes current     190  
Recognized amounts of identifiable assets acquired, Equipment     299  
Recognized amounts of identifiable assets acquired, Deferred taxes noncurrent     46  
Recognized amount of identifiable assets acquired, Customer list     7,785  
Total identifiable net assets acquired     9,614  
Goodwill $ 8,553   $ 3,391 $ 5,162