CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Apr. 30, 2018		Apr. 30, 2017
Net revenue:
Total net revenue		$ 559.9		$ 485.7
Cost of revenue:
Amortization of developed technology		3.6		4.7
Total cost of revenue		66.8		78.2
Gross profit		493.1		407.5
Operating expenses:
Marketing and sales		276.4		255.7
Research and development		172.8		187.7
General and administrative		72.9		78.3
Amortization of purchased intangibles		3.8		5.7
Restructuring and other facility exit costs, net		22.5		(0.3)
Total operating expenses		548.4		527.1
Loss from operations		(55.3)		(119.6)
Interest and other expense, net		(8.5)		(1.8)
Loss before income taxes		(63.8)		(121.4)
Provision for income taxes		(18.6)		(8.2)
Net loss		$ (82.4)		$ (129.6)
Basic net loss per share (in usd per share)		$ (0.38)		$ (0.59)
Diluted net loss per share (in usd per share)		$ (0.38)		$ (0.59)
Weighted average shares used in computing basic net loss per share (shares)		218.6		219.9
Weighted average shares used in computing diluted net loss per share (shares)		218.6		219.9
Maintenance and Subscription
Net revenue:
Total net revenue		$ 531.6		$ 437.0
Cost of revenue:
Total cost of revenue		50.4		54.9
Subscription
Net revenue:
Total net revenue		350.4		173.4
Maintenance
Net revenue:
Total net revenue		181.2		263.6
Other
Net revenue:
Total net revenue		28.3	[1]	48.7
Cost of revenue:
Total cost of revenue	[2]	$ 12.8		$ 18.6

[1] Previously labeled as "License and other" in prior periods.

[2] Previously labeled as "Cost of license and other revenue" in prior periods.