Business and Summary of Significant Accounting Policies - Stock Based Compensation Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 132.2	$ 156.3	$ 108.8
Tax benefit	(36.4)	(35.5)	(27.1)
Stock-based compensation expense related to stock awards and ESP Plan purchases, net	95.8	120.8	81.7
Cost of license and other revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	3.8	3.7	2.7
Cost of subscription
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	2.2	1.5	1.2
Marketing and sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	58.6	64.3	48.3
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	43.7	61.8	38.1
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated stock-based compensation expense	$ 23.9	$ 25.0	$ 18.5