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Capital Stock Capital Stock (Tables)
 9 Months Ended
Jan. 31, 2014
Equity [Abstract]  
Computation of basic and diluted net loss per ordinary share
The following table sets forth the computation of basic and diluted net loss per ordinary share:
 
Three months ended
 
Nine months ended
 
January 31, 2013
 
January 31, 2014
 
January 31, 2013
 
January 31, 2014
Net earnings (loss) attributable to controlling interest:
 
 
 
 
 
 
 
Continuing operations
$
(58,633
)
 
$
(60,003
)
 
$
(85,630
)
 
$
(149,324
)
Discontinued operations
212

 
—

 
1,024

 
—

Weighted average number of ordinary stock outstanding –
basic and diluted
46,519,484

 
51,573,832

 
46,519,484

 
48,204,267