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Acquisitions (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Jun. 01, 2015
Business Acquisition      
Business Combination, Consideration Transferred $ 27,848 $ 0  
STG      
Business Acquisition      
Business Combination, Consideration Transferred $ 27,848    
Finite-lived Intangible Assets Acquired     $ 349
Finite-lived Intangible Assets Acquired     14,500
Goodwill     14,117
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     $ 1,118