CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Net revenue [Abstract]:
License and other	$ 340.5	$ 333.0	$ 701.5	$ 656.0
Maintenance	228.2	213.3	455.8	418.6
Total net revenue	568.7	546.3	1,157.3	1,074.6
Cost of revenue [Abstract]:
Cost of license and other revenue	49.1	45.7	96.2	88.3
Cost of maintenance revenue	10.7	11.7	22.4	23.7
Total cost of revenue	59.8	57.4	118.6	112.0
Gross profit	508.9	488.9	1,038.7	962.6
Operating expenses [Abstract]:
Marketing and sales	212.4	201.0	435.6	402.9
Research and development	144.9	139.2	297.6	275.8
General and administrative	58.7	55.0	118.6	111.6
Restructuring	0	(1.3)	0	(1.3)
Total operating expenses	416.0	393.9	851.8	789.0
Income from operations	92.9	95.0	186.9	173.6
Interest and other income, net	(0.8)	(0.8)	2.7	5.1
Income before income taxes	92.1	94.2	189.6	178.7
Provision for income taxes	(27.5)	(23.0)	(46.1)	(38.2)
Net income	$ 64.6	$ 71.2	$ 143.5	$ 140.5
Basic net income per share (in usd per share)	$ 0.28	$ 0.31	$ 0.63	$ 0.61
Diluted net income per share (in usd per share)	$ 0.28	$ 0.30	$ 0.62	$ 0.59
Weighted average shares used in computing basic net income per share (in shares)	227.8	229.4	228.0	228.8
Weighted average shares used in computing diluted net income per share (in shares)	232.1	236.6	233.1	236.9