Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 28, 2012	Apr. 30, 2011	Jan. 28, 2012
Income Taxes [Abstract]
Net unrecognized tax benefits	$ 118.0	$ 124.1	$ 116.6
Effective income tax rate	38.50%	38.10%
Accrued amounts for interest and penalties	34.0	36.1	33.0
Possible decrease in unrecognized tax benefits that would reduce the provision for taxes on earnings, minimum	1.0
Possible decrease in unrecognized tax benefits that would reduce the provision for taxes on earnings, maximum	$ 50.0

The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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- Definition

The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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- Definition

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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