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Loss Per Share and Stockholders' Equity (Details) (USD $)
3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Apr. 30, 2014
Apr. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax $ (21,000) $ 4,299,000 $ (21,000) $ 4,299,000 $ 3,334,000 $ 6,809,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 6,598,000 (2,836,000) 6,598,000 (2,836,000) 1,843,000 3,741,000
Accumulated other comprehensive income 6,577,000 1,463,000 6,577,000 1,463,000 5,177,000 10,550,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax     4,128,000 (13,424,000)    
Other Comprehensive Income (Loss), Before Reclassifications, Tax     2,713,000 (4,337,000)    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     1,415,000      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax     0 [1]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax     (24,000) [1]      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax     0      
Tax effect of reclassification adjustment for gains included in income     (9,000)      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax     0      
Reclassification adjustment for gains included in income (589,000) 0 (15,000) 0    
Change in foreign currency translation adjustments (3,810,000) 582,000 (3,355,000) (2,510,000)    
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax     4,755,000 (6,577,000)    
Other Comprehensive Income (Loss), Net of Tax     1,400,000 (9,087,000)    
Net loss from continuing operations attributable to shareholders (113,227,000) (103,015,000) (222,078,000) (216,285,000)    
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 97,000 92,000 186,000 154,000    
Net loss from continuing operations attributable to common shareholders (113,324,000) (103,107,000) (222,264,000) (216,439,000)    
Basic weighted average common shares (in shares) 275,106,000 273,907,000 274,841,000 273,494,000    
Potential dilutive shares (in shares) 0 0 0 0    
Weighted Average Number of Shares Outstanding, Diluted 275,106,000 273,907,000 274,841,000 273,494,000    
Basic (in usd per share) $ (0.41) $ (0.38) $ (0.81) $ (0.79)    
Narrative Details [Abstract]            
Antidilutive securities excluded from computation of earnings per share, amount (in shares)     5,400,000 6,000,000    
Shares repurchased during the period, (in shares)     300,000 200,000    
Shares repurchased during the period, Value     10,200,000 5,300,000    
Shares issued during period (in shares)     1,200,000 1,600,000    
Nonvested units granted     1,000,000      
Stock-based compensation 7,100,000 6,200,000 14,600,000 10,800,000    
Unrecognized compensation costs, options 400,000   400,000      
Unrecognized compensation costs, nonvested shares and units 43,200,000   43,200,000      
Accumulated Translation Adjustment [Member]
           
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (3,355,000) (2,510,000)    
Other Comprehensive Income (Loss), Before Reclassifications, Tax     0 0    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (3,355,000)      
Accumulated Net Unrealized Investment Gain (Loss) [Member]
           
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), before Reclassifications, before Tax     7,483,000 (10,914,000)    
Other Comprehensive Income (Loss), Before Reclassifications, Tax     2,713,000 (4,337,000)    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     $ 4,770,000      
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