CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Statement [Abstract]
Revenue	$ 196,003	$ 177,156	$ 571,857	$ 512,679
Cost of revenue	56,812	56,302	166,141	158,858
Gross profit	139,191	120,854	405,716	353,821
Operating expenses:
Research and development	49,454	50,652	152,683	146,589
Sales and marketing	67,112	82,939	207,619	242,164
General and administrative	25,239	26,496	79,778	75,959
Total operating expenses	141,805	160,087	440,080	464,712
Loss from operations	(2,614)	(39,233)	(34,364)	(110,891)
Interest expense, net	(1,733)	(738)	(4,865)	(1,141)
Other (loss) income, net	(586)	(653)	1,630	(840)
Loss before provision for income taxes	(4,933)	(40,624)	(37,599)	(112,872)
Provision for income taxes	351	272	891	1,086
Net loss	$ (5,284)	$ (40,896)	$ (38,490)	$ (113,958)
Net loss per share, basic and diluted	$ (0.03)	$ (0.28)	$ (0.25)	$ (0.78)
Weighted-average shares used to compute net loss per share, basic and diluted	157,465	148,555	154,734	146,997