Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Business And Summary Of Significant Accounting Policies [Line Items]
Book overdrafts	$ 6.0	$ 30.0
Accounts receivable sold	284.7	176.6
Discount fees on sale of accounts receivable	2.6	1.1	0.5
Intangible assets, useful life, minimum, years	7 years	6 years	6 years
Product warranty period	2 years
Value added tax payable	236.0	187.5
Accumulated other comprehensive income, tax portion	23.0	23.0	23.0
Capitalized software and development costs
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years	8 years	6 years	5 years
Personal Computer Related Software
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years	3 years
Mainframe Software Licenses
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years	5 years
Maximum
Business And Summary Of Significant Accounting Policies [Line Items]
Revenue from configured product, percentage of net sales	10.00%	10.00%	10.00%
Product warranty charges, percentage of net sales			10.00%
Maximum | Capitalized software and development costs
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years	10 years
Maximum | Strategic Applications
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years	10 years
Minimum | Capitalized software and development costs
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years	3 years
Minimum | Strategic Applications
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years	7 years
Hewlett-Packard | Supplier Concentration Risk | Sales Revenue, Goods, Net
Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	21.00%	25.00%	27.00%
Apple | Supplier Concentration Risk | Sales Revenue, Goods, Net
Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	12.00%
SPAIN | Accrued Expenses and Other Liabilities
Business And Summary Of Significant Accounting Policies [Line Items]
Value added tax payable	55.6
Number of subsidiaries	1
Europe | Accrued Expenses and Other Liabilities
Business And Summary Of Significant Accounting Policies [Line Items]
Value added tax payable	55.6
Europe | Prepaid Expenses and Other Assets
Business And Summary Of Significant Accounting Policies [Line Items]
Value added tax receivable	$ 90.9	$ 66.7