CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Net revenue:
Maintenance	$ 261.8	$ 277.5	$ 525.4	$ 561.9
Subscription	196.1	101.8	369.5	187.3
Total maintenance and subscription revenue	457.9	379.3	894.9	749.2
License and other	43.9	171.4	92.6	313.4
Total net revenue	501.8	550.7	987.5	1,062.6
Cost of revenue:
Cost of maintenance and subscription revenue	52.8	46.8	107.7	93.4
Cost of license and other revenue	17.8	27.6	36.4	62.5
Amortization of developed technology	4.0	10.7	8.7	21.6
Total cost of revenue	74.6	85.1	152.8	177.5
Gross profit	427.2	465.6	834.7	885.1
Operating expenses:
Marketing and sales	257.6	243.1	513.3	483.9
Research and development	193.8	193.0	381.5	386.5
General and administrative	78.0	68.6	156.3	143.3
Amortization of purchased intangibles	4.9	7.8	10.6	15.7
Restructuring charges and other facility exit costs, net	0.5	16.0	0.2	68.3
Total operating expenses	534.8	528.5	1,061.9	1,097.7
Loss from operations	(107.6)	(62.9)	(227.2)	(212.6)
Interest and other expense, net	(18.8)	(10.1)	(20.6)	(13.7)
Loss before income taxes	(126.4)	(73.0)	(247.8)	(226.3)
Provision for income taxes	(17.6)	(25.2)	(25.8)	(39.6)
Net loss	$ (144.0)	$ (98.2)	$ (273.6)	$ (265.9)
Basic net loss per share (in usd per share)	$ (0.66)	$ (0.44)	$ (1.25)	$ (1.19)
Diluted net loss per share (in usd per share)	$ (0.66)	$ (0.44)	$ (1.25)	$ (1.19)
Weighted average shares used in computing basic net loss per share (shares)	219.5	223.2	219.7	223.8
Weighted average shares used in computing diluted net loss per share (shares)	219.5	223.2	219.7	223.8