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Business Combinations (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
Jan. 31, 2014
Aug. 14, 2014
RelateIQ, Inc. [Member]
Business Acquisition [Line Items]      
Cash     $ 39,194
Intangible assets     16,200
Goodwill 3,782,569 3,500,823 289,857
Current and noncurrent liabilities     (4,700)
Deferred tax liability     (345)
Net assets acquired     $ 340,206