Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	[1]	Jul. 31, 2018	Jul. 31, 2017
Revenue:
Product	$ 241,137	$ 179,669		$ 436,586	$ 322,519
Support subscription	67,747	45,001		128,243	84,796
Total revenue	308,884	224,670		564,829	407,315
Cost of revenue:
Product	78,262	57,252		144,682	103,897
Support subscription	24,457	19,199		47,667	36,102
Total cost of revenue	102,719	76,451		192,349	139,999
Gross profit	206,165	148,219		372,480	267,316
Operating expenses:
Research and development	84,031	69,361		162,523	134,789
Sales and marketing	143,749	117,552		266,116	209,315
General and administrative	33,591	22,162		60,921	42,258
Total operating expenses	261,371	209,075		489,560	386,362
Loss from operations	(55,206)	(60,856)		(117,080)	(119,046)
Other income (expense), net	(4,032)	3,266		(5,031)	5,261
Loss before provision for income taxes	(59,238)	(57,590)		(122,111)	(113,785)
Provision for income taxes	885	821		2,316	1,785
Net loss	$ (60,123)	$ (58,411)	[2]	$ (124,427)	$ (115,570)	[3]
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.26)	$ (0.28)		$ (0.55)	$ (0.56)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	229,359	209,193		226,609	207,515

[1] * Prior period information has been adjusted to reflect the adoption impact of ASC 606, which we adopted on February 1, 2018.

[2] * Prior period information has been adjusted to reflect the adoption impact of ASC 606, which we adopted on February 1, 2018.

[3] * Prior period information has been adjusted to reflect the adoption impact of ASC 606 and ASU 2016-18, which we adopted on February 1, 2018