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Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Stock-Based Compensation (Textual) [Abstract]        
Compensation expenses recognized for stock-based awards granted $ 287,000 $ 870,000 $ 553,000 $ 1,064,000