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Acquisitions (Narrative) (Details) - STG - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jun. 01, 2015
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 14.5
Business Combination, Consideration Transferred   $ 27.8  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets     0.3
Goodwill, Gross     14.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     $ 1.1
Maximum      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years