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Long term debt (Tables)
 12 Months Ended
Mar. 31, 2013
Debt Disclosure [Abstract]  
Schedule of long term debt
Long term debt is as follows:
Current:
 
 
 
 
  
 
March 31, 2013

 
March 31, 2012

Credit facilities (note 16(b))
 
$
9,392

 
$
10,000

Capital lease obligations (note 16(c))
 
12,017

 
4,402

 
 
$
21,409

 
$
14,402

Long term:
 
 
 
 
  
 
March 31, 2013

 
March 31, 2012

Credit facilities (note 16(b))
 
$
35,850

 
$
68,767

Capital lease obligations (note 16(c))
 
29,805

 
6,299

Series 1 Debentures (note 16(e))
 
225,000

 
225,000

 
 
$
290,655

 
$
300,066
Schedule of credit facilities
Credit Facilities
  
 
March 31, 2013

 
March 31, 2012

Term A Facility
 
$
17,202

 
$
20,950

Term B Facility
 
5,644

 
37,496

Total Term Facilities
 
$
22,846

 
$
58,446

Revolving Facility
 
22,396

 
20,321

Total credit facilities
 
$
45,242

 
$
78,767

Less: current portion of Term Facilities
 
(9,392
)
 
(10,000
)
 
 
$
35,850

 
$
68,767
Schedule of future minimum lease payments due under capital leases
The minimum lease payments due in each of the next five fiscal years are as follows:
2014
 
$
14,442

2015
 
13,490

2016
 
12,156

2017
 
6,887

2018
 
—

Subtotal:
 
$
46,975

Less: amount representing interest
 
(5,153
)
Present value of minimum lease payments
 
$
41,822

Less: current portion
 
(12,017
)
Long term portion
 
$
29,805