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Intangible Assets Acquired Through Business Combinations and Goodwill (Goodwill) (Details)
$ in Thousands
9 Months Ended
Oct. 31, 2017
USD ($)
Goodwill [Roll Forward]  
Goodwill beginning balance $ 7,263,846
Adjustments of acquisition date fair values, including the effect of foreign currency translation 7,313
Goodwill ending balance 7,294,141
Sequence, Inc. acquisition  
Goodwill [Roll Forward]  
Sequence, Inc. acquisition $ 22,982