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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 30, 2011	Jul. 31, 2010	Jul. 30, 2011	Jul. 31, 2010
Income Taxes [Line Items]
Effective income tax rate from continuing operations	36.00%	30.30%	34.80%	32.00%
Decrease in unrecognized tax benefits, primarily due to federal and state income tax settlements and other changes in income tax reserves	$ (1.5)	$ (2.6)

- 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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