Business and Summary of Significant Accounting Policies Stock Based Compensation Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and ESP Plan purchases	$ 30.0	$ 25.6	$ 27.3	$ 25.9	$ 18.4	$ 17.0	$ 21.0	$ 24.3	$ 108.8	$ 80.7	$ 93.6
Tax benefit									(27.1)	(22.0)	(22.2)
Stock-based compensation expense related to stock awards and ESP Plan purchases									81.7	58.7	71.4
Cost of license and other revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									3.9	2.9	3.1
Marketing and sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									48.3	35.5	41.1
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									38.1	27.4	30.0
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									$ 18.5	$ 14.9	$ 19.4