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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		9 Months Ended
	Jan. 28, 2012	Oct. 27, 2012 US	Oct. 27, 2012 UK
Income Taxes [Line Items]
Tax years subject to examination		Tax years ending after November 1, 2008	Tax years ending after January 31, 2010
Unrecognized tax benefits	$ 4.8
Accrued interest related to unrecognized tax benefits	$ 0.4

This element represents the amount of interest expense accrued as of the date of the statement of financial position 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.

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