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Inventories (Tables)
 9 Months Ended
Jan. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of Inventory
 
April 30, 2013
 
January 31, 2014
Work-in-progress for maintenance contracts under completed contract accounting
$
3,661

 
$
6,539

Consumables
111,862

 
125,715

Provision for obsolescence
(9,729
)
 
(7,690
)
 
$
105,794

 
$
124,564