Earnings Per Share (Computation of Basic and Diluted Earnings per Share from Continuing Operations) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	12 Months Ended
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
Earnings Per Share
Net income from continuing operations attributable to shareholders	$ (106,812)	$ (127,638)	$ 692,432	$ 53,603	$ (126,472)	$ (130,617)	$ 419,405	$ 488,946	$ 513,055
Amounts allocated to participating securities (nonvested shares)							(1,085)	(1,888)	(2,042)
Net income from continuing operations attributable to common shareholders							$ 418,320	$ 487,058	$ 511,013
Basic weighted average common shares							309,230	332,283	332,787
Potential dilutive shares							547	953	1,752
Dilutive weighted average common shares							309,777	333,236	334,539
Earnings per share from continuing operations attributable to common shareholders:
Basic	$ (0.35)	$ (0.40)	$ 2.11	$ 0.16	$ (0.38)	$ (0.39)	$ 1.35	$ 1.47	$ 1.53
Diluted	$ (0.35)	$ (0.40)	$ 2.11	$ 0.16	$ (0.38)	$ (0.39)	$ 1.35	$ 1.46	$ 1.53

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Earnings Loss Per Share And Stockholders Equity [Abstract]

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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