Acquisitions - Schedule of Assets and Liabilities Assumed (Details) - USD ($) $ in Thousands	Nov. 07, 2019	Nov. 01, 2019	Jan. 31, 2020	Jan. 31, 2019
Business Acquisition [Line Items]
Goodwill			$ 438,529	$ 95,804
Crossix
Business Acquisition [Line Items]
Net assets acquired		$ 4,766
Identifiable intangible assets:		108,500
Goodwill		314,642
Total purchase consideration		$ 427,908
Physicians World
Business Acquisition [Line Items]
Net assets acquired	$ 1,221
Identifiable intangible assets:	11,700
Goodwill	28,083
Total purchase consideration	$ 41,004
Customer relationships
Business Acquisition [Line Items]
Useful lives of intangible assets	10 years	10 years
Customer relationships | Crossix
Business Acquisition [Line Items]
Identifiable intangible assets:		$ 70,100
Customer relationships | Physicians World
Business Acquisition [Line Items]
Identifiable intangible assets:	$ 7,700
Existing technology
Business Acquisition [Line Items]
Useful lives of intangible assets	6 years	6 years
Existing technology | Crossix
Business Acquisition [Line Items]
Identifiable intangible assets:		$ 19,200
Existing technology | Physicians World
Business Acquisition [Line Items]
Identifiable intangible assets:	$ 3,300
Trade name/Trademarks
Business Acquisition [Line Items]
Useful lives of intangible assets	3 years	5 years
Trade name/Trademarks | Crossix
Business Acquisition [Line Items]
Identifiable intangible assets:		$ 13,200
Trade name/Trademarks | Physicians World
Business Acquisition [Line Items]
Identifiable intangible assets:	$ 700
Other intangibles | Crossix
Business Acquisition [Line Items]
Identifiable intangible assets:		$ 6,000
Minimum | Other intangibles
Business Acquisition [Line Items]
Useful lives of intangible assets		1 year
Maximum | Other intangibles
Business Acquisition [Line Items]
Useful lives of intangible assets		7 years