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Loss Per Share and Stockholders' Equity (Tables)
 9 Months Ended
Jan. 31, 2017
Earnings Per Share [Abstract]  
Schedule Of Share Repurchase And Retirements [Table Text Block]
The cost of shares retired was allocated to the components of stockholders’ equity as follows:
 
 
(in 000s)
 
Nine months ended January 31,
 
2017

 
2016

Common stock
 
$
140

 
$
525

Additional paid-in-capital
 
8,412

 
31,506

Retained earnings
 
308,468

 
1,859,807

Total
 
$
317,020

 
$
1,891,838

 
 
 
 
 
Computations Of Basic And Diluted Earnings Per Share
The computations of basic and diluted earnings per share from continuing operations are as follows:
(in 000s, except per share amounts)
 
 
 
Three months ended January 31,
 
Nine months ended January 31,
 
 
2017

 
2016

 
2017

 
2016

Net loss from continuing operations attributable to shareholders
 
$
(101,212
)
 
$
(78,649
)
 
$
(365,653
)
 
$
(317,672
)
Amounts allocated to participating securities
 
(143
)
 
(112
)
 
(410
)
 
(316
)
Net loss from continuing operations attributable to common shareholders
 
$
(101,355
)
 
$
(78,761
)
 
$
(366,063
)
 
$
(317,988
)
 
 
 
 
 
 
 
 
 
Basic weighted average common shares
 
207,862

 
231,904

 
214,627

 
257,979

Potential dilutive shares
 
—

 
—

 
—

 
—

Dilutive weighted average common shares
 
207,862

 
231,904

 
214,627

 
257,979

 
 
 
 
 
 
 
 
 
Loss per share from continuing operations attributable to common shareholders:
Basic
 
$
(0.49
)
 
$
(0.34
)
 
$
(1.71
)
 
$
(1.23
)
Diluted
 
(0.49
)
 
(0.34
)
 
(1.71
)
 
(1.23
)