Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jul. 31, 2011	Oct. 31, 2011	Jan. 31, 2012 years	Jan. 31, 2011	Jan. 31, 2010
Business And Summary Of Significant Accounting Policies [Line Items]
Decrease in cash adjustment	$ 74.5	$ 97.8	$ 115.5				$ 76.2
Decrease in accounts payable adjustment	74.5	97.8	115.5				76.2
Increase in cash flows from operating activities adjustment					1.7		57.5
Decrease in cash flows from operating activities adjustment			39.2	21.6				8.5
Book overdrafts						28.7	20.1
Intangible assets, useful life, minimum, years						3
Intangible assets, useful life, maximum, years						10
Product warranty period						2
Accumulated other comprehensive income, tax portion						$ 23.0	$ 23.0	$ 23.0
Previous sampling period use to estimate forfeiture rate						5
Capitalized Software And Development Costs [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years						3
Intangible assets, useful life, maximum, years						10
Personal Computer Related Software [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, years						3
Mainframe Software Licenses [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, years						5
Strategic Applications [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years						7
Intangible assets, useful life, maximum, years						10
Supplier Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage						25.00%	27.00%	28.00%
Maximum [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Product warranty charges, percentage of net sales						10.00%	10.00%	10.00%
Maximum [Member] | Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage						10.00%	10.00%	10.00%