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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, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Earnings Loss Per Share And Stockholders' Equity [Abstract]        
Net loss from continuing operations attributable to shareholders $ (123,013) $ (111,444) $ (242,168) $ (239,252)
Amounts allocated to participating securities (nonvested shares) 62 (26) 176 (7)
Net loss from continuing operations attributable to common shareholders $ (123,075) $ (111,418) $ (242,344) $ (239,245)
Basic weighted average common shares 299,895 306,804 302,693 313,247
Potential dilutive shares            
Dilutive weighted average common shares 299,895 306,804 302,693 313,247
Loss per share from continuing operations:        
Basic $ (0.41) $ (0.36) $ (0.80) $ (0.77)
Diluted $ (0.41) $ (0.36) $ (0.80) $ (0.77)