Quarterly Financial Data (Summary of Quarterly Financial Information) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	12 Months Ended
Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2010	Oct. 31, 2009	Jul. 31, 2009	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Quarterly Financial Data
Revenues	$ 851,482	$ 322,889	$ 274,474	$ 2,337,894	$ 934,852	$ 326,081	$ 275,505	$ 3,774,296	$ 3,874,332	$ 4,083,577
Income (loss) from continuing operations before taxes (benefit)		(175,119)	(207,317)	1,110,410	97,451	(212,853)	(210,873)	677,025	784,135	839,370
Income taxes (benefit)		(68,307)	(79,679)	417,978	43,848	(86,381)	(80,256)	257,620	295,189	326,315
Net income from continuing operations		(106,812)	(127,638)	692,432	53,603	(126,472)	(130,617)	419,405	488,946	513,055
Net loss from discontinued operations		(2,237)	(3,043)	(1,604)	(2,968)	(2,115)	(3,017)	(13,295)	(9,704)	(27,382)
NET INCOME		$ (109,049)	$ (130,681)	$ 690,828	$ 50,635	$ (128,587)	$ (133,634)	$ 406,110	$ 479,242	$ 485,673
Net income from continuing operations		$ (0.35)	$ (0.40)	$ 2.11	$ 0.16	$ (0.38)	$ (0.39)	$ 1.35	$ 1.47	$ 1.53
Net loss from discontinued operations		$ (0.01)	$ (0.01)		$ (0.01)		$ (0.01)	$ (0.04)	$ (0.03)	$ (0.08)
Net income		$ (0.36)	$ (0.41)	$ 2.11	$ 0.15	$ (0.38)	$ (0.40)	$ 1.31	$ 1.44	$ 1.45
Net income (loss) from continuing operations		$ (0.35)	$ (0.40)	$ 2.11	$ 0.16	$ (0.38)	$ (0.39)	$ 1.35	$ 1.46	$ 1.53
Net loss from discontinued operations		$ (0.01)	$ (0.01)	$ (0.01)	$ (0.01)		$ (0.01)	$ (0.04)	$ (0.03)	$ (0.08)
Net income		$ (0.36)	$ (0.41)	$ 2.10	$ 0.15	$ (0.38)	$ (0.40)	$ 1.31	$ 1.43	$ 1.45

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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