Business Combinations (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2014	Aug. 14, 2014
Business Acquisition [Line Items]
Goodwill beginning balance	$ 3,500,823
Finalization of acquisition date fair values	(8,111)
Goodwill ending balance	3,782,569
RelateIQ, Inc. [Member]
Business Acquisition [Line Items]
Goodwill beginning balance		289,857
Goodwill, Acquired During Period	289,857
Goodwill ending balance		$ 289,857