Income Taxes (Schedule Of Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Unrecognized Tax Benefits [Roll Forward]
Balance, beginning of the year	$ 146,391	$ 206,393	$ 154,848
Additions based on tax positions related to prior years	9,743	11,867	26,523
Reductions based on tax positions related to prior years	(25,403)	(49,493)	(3,858)
Additions based on tax positions related to the current year	7,399	2,314	42,735
Reductions related to settlements with tax authorities	(23,993)	(25,259)	(8,742)
Expiration of statute of limitations	(11,853)	(702)	(2,814)
Reductions related to foreign currency translation	0	(278)	(838)
Reductions related to other	(9,207)	(1,549)	(1,461)
Balance, end of the year	$ 111,491	$ 146,391	$ 206,393