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Assets Held for Sale (Tables)
 9 Months Ended
Jan. 31, 2014
Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract]  
Classification of Assets Held for Sale
We have classified certain assets such as aircraft and buildings as held for sale as these assets are ready for immediate sale and management expects these assets to be sold within one year. 
 
April 30, 2013
 
January 31, 2014
 
# Aircraft
 
 
 
# Aircraft
 
 
Aircraft held for sale:
 
 
 
 
 
 
 
Book value, beginning of period
18

 
$
79,293

 
14

 
$
30,206

Classified as held for sale, net of impairment
11

 
7,454

 
15

 
28,491

Sales
(10
)
 
(35,303
)
 
(8
)
 
(19,185
)
Reclassified as held for use
(5
)
 
(21,049
)
 
(7
)
 
(8,014
)
Foreign exchange
—

 
(189
)
 
—

 
(810
)
Aircraft held for sale
14

 
30,206

 
14

 
30,688

Buildings held for sale
—

 
1,841

 
—

 
1,949

Total assets held for sale
 
 
$
32,047

 
 
 
$
32,637