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Income Taxes (Tables)
 9 Months Ended
Jan. 31, 2014
Income Tax Disclosure [Abstract]  
Summary of Income Tax Recovery (Expense)
The income tax expense differs from the amount that would have resulted from applying the Cayman Islands statutory income tax rates to loss from continuing operations before income taxes as follows:
 
 
Three months ended
 
Nine months ended
 
January 31, 2013
 
January 31, 2014
 
January 31, 2013
 
January 31, 2014
Loss from continuing operations before income tax
$
(18,603
)
 
$
(51,185
)
 
$
(37,949
)
 
$
(127,349
)
Combined Cayman Islands statutory income tax rate
—
%
 
—
%
 
—
%
 
—
%
Income tax recovery calculated at statutory rate
—

 
—

 
—

 
—

(Increase) decrease in income tax recovery (expense) resulting from:
 
 
 
 
 
 
 
Rate differences in various jurisdictions
11,789

 
20,408

 
28,745

 
52,997

Change in tax law
(401
)
 
(99
)
 
(1,158
)
 
(704
)
Non-deductible items
(10,607
)
 
(30,287
)
 
(26,815
)
 
(61,254
)
Other foreign taxes
(9,434
)
 
(3,378
)
 
(15,229
)
 
(10,668
)
Non-deductible portion of capital losses
101

 
(3,365
)
 
166

 
(2,775
)
Non-taxable income
7,099

 
12,620

 
22,154

 
32,019

Adjustments to prior years
(1,324
)
 
(133
)
 
(2,030
)
 
510

Functional currency adjustments
(2,741
)
 
4,345

 
1,457

 
7,657

Valuation allowance
(38,524
)
 
(6,783
)
 
(57,338
)
 
(35,281
)
Other
(261
)
 
(17
)
 
(558
)
 
10

Income tax expense
$
(44,303
)
 
$
(6,689
)
 
$
(50,606
)
 
$
(17,489
)