Segment Information - Reconciliation of Segment Financial Information to Loss from Operations (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2020	Apr. 30, 2019
Segment Reporting Information [Line Items]
Segment contribution margin		$ 167,277	$ 137,224
Amortization of acquired intangible assets		(19,700)	(20,200)
Corporate costs, such as research and development, corporate general and administrative and other	[1],[2]	(212,026)	(229,988)
Loss from operations		(55,807)	(103,753)
Operating Segments
Segment Reporting Information [Line Items]
Segment contribution margin		167,277	137,224
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Amortization of acquired intangible assets		(19,676)	(20,160)
Stock-based compensation expense		(53,438)	(48,871)
Corporate costs, such as research and development, corporate general and administrative and other		$ (149,970)	$ (171,946)

[1] Amounts include amortization of acquired intangible assets as follows (in thousands): Three Months Ended April 30,20202019Cost of revenue – subscription $3,079  $2,910  Sales and marketing 16,597  17,250  

[2] Amounts include stock-based compensation expense as follows (in thousands): Three Months Ended April 30,20202019 Cost of revenue – subscription $3,992  $3,819   Cost of revenue – services 3,987  4,260   Research and development 19,824  17,841   Sales and marketing 15,823  13,364   General and administrative 9,812  9,587