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Other long term obligations (Tables)
 12 Months Ended
Mar. 31, 2013
Other Liabilities Disclosure [Abstract]  
Schedule of other long term obligations
Other long term obligations are as follows:
 
 
March 31, 2013

 
March 31, 2012

Liabilities related to equipment leases
 
$
104

 
$
3,169

Deferred lease inducements (note 18(b))
 
440

 
547

Asset retirement obligation (note 18(c))
 
477

 
434

Senior executive stock option plan (note 24(c))
 
925

 
1,322

Restricted share unit plan (note 24(e))
 
2,768

 
3,170

Directors' deferred stock unit plan (note 24(f))
 
3,106

 
2,284

 
 
$
7,820

 
$
10,926

Less current portion of:
 
 
 
 
Restricted share unit plan (note 24(e))
 
(719
)
 
(2,066
)
Directors' deferred share unit plan (note 24(f))
 
(355
)
 
—

 
 
$
6,746

 
$
8,860
Schedule of changes in deferred lease inducements
 
 
March 31, 2013

 
March 31, 2012

Balance, beginning of year
 
$
547

 
$
654

Amortization of deferred lease inducements
 
(107
)
 
(107
)
Balance, end of year
 
$
440

 
$
547
Schedule of changes in asset retirement obligation
The following table presents a continuity of the liability for the asset retirement obligation:
 
 
March 31, 2013

 
March 31, 2012

Balance, beginning of year
 
$
434

 
$
395

Accretion expense
 
43

 
39

Balance, end of year
 
$
477

 
$
434