Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit) For Continuing Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Income Tax Disclosure [Abstract]
Federal, Current									$ 195,277	$ 219,411	$ 126,773
State, Current									33,274	43,116	21,285
Foreign, Current									6,749	3,173	8,647
Current income tax expense (benefit)									235,300	265,700	156,705
Federal, Deferred									28,624	(29,258)	55,032
State, Deferred									5,475	(69)	18,154
Foreign, Deferred									(2,380)	480	211
Deferred taxes									31,719	(28,847)	73,397
Total income taxes for continuing operations	$ 549,664	$ (135,074)	$ (76,347)	$ (71,224)	$ 440,914	$ (79,353)	$ (61,089)	$ (63,619)	$ 267,019	$ 236,853	$ 230,102