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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

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- Definition

Carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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The average effective interest rate during the reporting period.

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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