Loss Per Share And Stockholders' Equity (Computation Of Basic And Diluted Earnings Per Share From Continuing Operations) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended
Jul. 31, 2011	Jul. 31, 2010
Loss Per Share And Stockholders' Equity
Net loss from continuing operations attributable to shareholders	$ (173,443)	$ (127,638)
Amounts allocated to participating securities (nonvested shares)	(114)	(20)
Net loss from continuing operations attributable to common shareholders	$ (173,557)	$ (127,658)
Basic weighted average common shares	305,491	319,690
Potential dilutive shares
Dilutive weighted average common shares	305,491	319,690
Loss per share from continuing operations:
Basic	$ (0.57)	$ (0.40)
Diluted	$ (0.57)	$ (0.40)

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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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