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Accumulated Other Comprehensive Income (Loss), Net of Taxes (Detail) (USD $)
In Millions
Jul. 31, 2011
Jan. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net loss on derivative instruments $ (0.3) $ (0.8)
Net unrealized gain on available-for-sale securities 3.4 2.4
Unfunded portion of pension plans (9.8) (9.8)
Foreign currency translation adjustments 21.0 7.6
Accumulated other comprehensive income (loss) $ 14.3 $ (0.6)