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Unaudited Quarterly Consolidated Statement of Operations (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Feb. 02, 2013
Oct. 27, 2012
Jan. 28, 2012
Oct. 29, 2011
Feb. 02, 2013
Jan. 28, 2012
Jan. 29, 2011
Quarterly Financial Information [Line Items]              
Debt extinguishment expense     $ 0.6 $ 0.4   $ (1.0) $ (6.0)
Asset impairments and restructuring charges     81.2 81.2 53.7 81.2 1.5
Asset impairments 1.9 51.8          
Goodwill impairment   $ 627.0     $ 627.0