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Goodwill and Other Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Jan. 31, 2012
Amortization expense related to amortizable intangible assets    
2013 $ 338  
2014 669  
2015 669  
2016 669  
2017 669  
2018 and thereafter 1,318  
Total $ 4,332 $ 4,696