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Borrowings (Schedule Of Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jan. 31, 2012
Apr. 30, 2011
Jan. 31, 2011
Debt Instrument [Line Items]      
Commercial paper $ 230,947   $ 632,566
Other 41,002 41,119 40,913
Total long-term debt 1,040,237 1,040,084 1,039,788
Less: Current portion (630,996) (557) (551)
Total borrowings 409,241 1,039,527 1,039,237
Senior Notes, 7.875%, Due January 2013 [Member]
     
Debt Instrument [Line Items]      
Senior Notes 599,871 599,788 599,758
Senior notes, interest rate 7.875%    
Senior notes, maturity date Jan. 01, 2013    
Senior Notes, 5.125%, Due October 2014 [Member]
     
Debt Instrument [Line Items]      
Senior Notes $ 399,364 $ 399,177 $ 399,117
Senior notes, interest rate 5.125%    
Senior notes, maturity date Oct. 01, 2014