CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Net revenue [Abstract]:
License and other	$ 297.5	$ 310.2	$ 934.2	$ 999.4
Subscription Revenue	257.7	237.8	753.1	705.9
Total net revenue	555.2	548.0	1,687.3	1,705.3
Cost of revenue [Abstract]:
Cost of license and other revenue	43.4	41.3	130.6	124.6
Cost of subscription revenue	23.7	16.6	71.8	51.9
Total cost of revenue	67.1	57.9	202.4	176.5
Gross profit	488.1	490.1	1,484.9	1,528.8
Operating expenses [Abstract]:
Marketing and sales	203.4	203.9	610.3	639.5
Research and development	149.0	153.0	448.7	450.6
General and administrative	63.2	62.1	186.3	180.7
Restructuring	4.4	36.7	6.5	36.7
Total operating expenses	420.0	455.7	1,251.8	1,307.5
Income from operations	68.1	34.4	233.1	221.3
Interest and other income, net	(1.1)	0.1	9.5	(2.6)
Income before income taxes	69.2	34.3	223.6	223.9
Provision for income taxes	(11.6)	(4.9)	(48.7)	(51.0)
Net income	$ 57.6	$ 29.4	$ 174.9	$ 172.9
Basic net income per share (in usd per share)	$ 0.26	$ 0.13	$ 0.78	$ 0.76
Diluted net income per share (in usd per share)	$ 0.25	$ 0.13	$ 0.77	$ 0.75
Weighted average shares used in computing basic net income per share (in shares)	223.1	225.5	223.4	227.1
Weighted average shares used in computing diluted net income per share (in shares)	227.7	229.9	228.6	231.4