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Comprehensive Income (Tables)
3 Months Ended
Jul. 31, 2011
Comprehensive Income [Abstract]  
Summarized net income for the other items included in the determination of comprehensive income
                 
    Three Months Ended  
    July 31,  
(Dollars in millions)   2010     2011  
Net income
  $ 111.4     $ 118.1  
Other comprehensive income (loss), net of tax:
               
Postretirement benefits adjustment
    2.6       3.3  
Foreign currency translation adjustment
    (8.8 )     (9.3 )
Net (loss) gain on cash flow hedges
    (2.4 )     4.0  
 
           
 
    (8.6 )     (2.0 )
 
           
Comprehensive income
  $ 102.8     $ 116.1  
 
           
Accumulated other comprehensive income (loss), net of tax
                 
    April 30,     July 31,  
(Dollars in millions)   2011     2011  
Postretirement benefits adjustment
  $ (164.5 )   $ (161.2 )
Cumulative translation adjustment
    48.1       38.8  
Unrealized loss on cash flow hedge contracts
    (13.6 )     (9.6 )
 
           
 
  $ (130.0 )   $ (132.0 )