CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Document Period End Date			Jul. 31, 2013
Net revenue [Abstract]:
License and other	$ 313.2	$ 334.0	$ 636.7	$ 689.2
Subscription Revenue	248.5	234.7	495.4	468.1
Total net revenue	561.7	568.7	1,132.1	1,157.3
Cost of revenue [Abstract]:
Cost of license and other revenue	42.8	42.5	87.2	83.3
Cost of subscription revenue	25.0	17.3	48.1	35.3
Total cost of revenue	67.8	59.8	135.3	118.6
Gross profit	493.9	508.9	996.8	1,038.7
Operating expenses [Abstract]:
Marketing and sales	198.1	212.4	406.9	435.6
Research and development	148.9	144.9	299.7	297.6
General and administrative	61.6	58.7	123.1	118.6
Restructuring	1.7	0	2.1	0
Total operating expenses	410.3	416.0	831.8	851.8
Income from operations	83.6	92.9	165.0	186.9
Interest and other income, net	1.8	0.8	10.6	(2.7)
Income before income taxes	81.8	92.1	154.4	189.6
Provision for income taxes	(20.1)	(27.5)	(37.1)	(46.1)
Net income	$ 61.7	$ 64.6	$ 117.3	$ 143.5
Basic net income per share (in usd per share)	$ 0.28	$ 0.28	$ 0.52	$ 0.63
Diluted net income per share (in usd per share)	$ 0.27	$ 0.28	$ 0.51	$ 0.62
Weighted average shares used in computing basic net income per share (in shares)	223.1	227.8	223.6	228.0
Weighted average shares used in computing diluted net income per share (in shares)	228.3	232.1	229.3	233.1