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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Income Taxes [Line Items]
Effective income tax rate from continuing operations	30.30%	36.50%	32.80%	35.40%
Significant changes in unrecognized tax benefits	$ 7.3
Unrecognized tax benefits decrease expected to be recognized with in the next twelve months	$ 8.2

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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