CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Net revenue:
Maintenance	$ 244.4	$ 273.2	$ 769.8	$ 835.1
Subscription	231.1	112.4	600.6	299.7
Total maintenance and subscription revenue	475.5	385.6	1,370.4	1,134.8
License and other	39.8	104.0	132.4	417.4
Total net revenue	515.3	489.6	1,502.8	1,552.2
Cost of revenue:
Cost of maintenance and subscription revenue	53.9	46.8	161.6	140.2
Cost of license and other revenue	19.6	24.3	56.0	86.8
Amortization of developed technology	4.0	10.4	12.7	32.0
Total cost of revenue	77.5	81.5	230.3	259.0
Gross profit	437.8	408.1	1,272.5	1,293.2
Operating expenses:
Marketing and sales	272.5	255.0	785.8	738.9
Research and development	191.8	192.6	573.3	579.1
General and administrative	68.8	70.4	225.1	213.7
Amortization of purchased intangibles	4.7	6.8	15.3	22.5
Restructuring charges and other facility exit costs, net	0.0	3.2	0.2	71.5
Total operating expenses	537.8	528.0	1,599.7	1,625.7
Loss from operations	(100.0)	(119.9)	(327.2)	(332.5)
Interest and other expense, net	(11.2)	(9.4)	(31.8)	(23.1)
Loss before income taxes	(111.2)	(129.3)	(359.0)	(355.6)
Provision for income taxes	(8.6)	(13.5)	(34.4)	(53.1)
Net loss	$ (119.8)	$ (142.8)	$ (393.4)	$ (408.7)
Basic net loss per share (in usd per share)	$ (0.55)	$ (0.64)	$ (1.79)	$ (1.83)
Diluted net loss per share (in usd per share)	$ (0.55)	$ (0.64)	$ (1.79)	$ (1.83)
Weighted average shares used in computing basic net loss per share (shares)	219.6	222.3	219.7	223.3
Weighted average shares used in computing diluted net loss per share (shares)	219.6	222.3	219.7	223.3