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Debt (Tables)
 12 Months Ended
Mar. 31, 2014
Debt  
Schedule of debt obligations

 

 
   As at March 31  
 
   2014   2013  

8.875% Senior Notes due 2018

   $ —   $ 643,790  

6.50% Senior Notes due 2019

     575,000     —  

Revolving credit facilities

     119,500     65,000  
           
​ ​ ​ ​ ​ ​ ​ ​

 

     694,500     708,790  

Less: portion classified as current

     (119,500 )   (65,000 )
           
​ ​ ​ ​ ​ ​ ​ ​

 

   $ 575,000   $ 643,790  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​