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Accumulated Other Comprehensive Income (Loss), Net of Taxes (Detail) (USD $)
In Millions
Apr. 30, 2011
Jan. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net loss on derivative instruments $ (8.6) $ (0.8)
Net unrealized gain on available-for-sale securities 3.1 2.4
Unfunded portion of pension plans (9.8) (9.8)
Foreign currency translation adjustments 20.1 7.6
Accumulated other comprehensive income (loss) $ 4.8 $ (0.6)