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Accumulated Other Comprehensive Income (Loss) Not Yet Recognized as Income (Expense) (Detail) (Accumulated Other Comprehensive Income/(loss) Not Yet Recognized As Income/(Expense), USD $)
In Millions, unless otherwise specified
Feb. 02, 2013
Jan. 28, 2012
Jan. 29, 2011
Accumulated Other Comprehensive Income/(loss) Not Yet Recognized As Income/(Expense)
     
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss $ (44.4) $ (51.5) $ (46.0)
Net prior service credit $ 17.1 $ 19.1 $ 14.3