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, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and ESP Plan purchases	$ 37.5	$ 51.9	$ 33.5	$ 33.4	$ 30.0	$ 25.6	$ 27.3	$ 25.9	$ 156.3	$ 108.8	$ 80.7
Tax benefit									(35.5)	(27.1)	(22.0)
Stock-based compensation expense related to stock awards and ESP Plan purchases									120.8	81.7	58.7
Cost of license and other revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									5.2	3.9	2.9
Marketing and sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									64.3	48.3	35.5
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									61.8	38.1	27.4
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									$ 25.0	$ 18.5	$ 14.9