Discontinued Operations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010	Jan. 29, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, tax expense(benefit)	$ 0	$ 0	$ 0	$ 0
Lease-related liabilities from discontinued operations	5.6		5.6		6.3
Cash payments on lease-related liabilities from discontinued operations			2.1
Additional expense related to liability adjustments			1.4
Lease-related liabilities from discontinued operations expected to be paid out within the next 12 months	2.4		2.4
Lease-related liabilities from discontinued operations expected to be paid after 12 months through 2019	$ 3.2		$ 3.2

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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+ Details