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Derivatives And Hedging Activities Notional Amount of Forward Contracts (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Derivative [Line Items]      
Notional Amount of Cash Flow Hedge Instruments $ 230.8 $ 283.7 $ 280.0
Derivatives Designated As Hedges [Member] | Forward contracts related to tobacco purchase [Member]
     
Derivative [Line Items]      
Notional Amount of Cash Flow Hedge Instruments 182.5 235.2 238.6
Derivatives Not Designated As Hedges [Member] | Forward contracts related to tobacco processing costs [Member]
     
Derivative [Line Items]      
Notional Amount of Cash Flow Hedge Instruments $ 48.3 $ 48.5 $ 41.4