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Stock-based compensation (Tables)
 12 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock-based compensation expenses included in general and administrative expenses
Stock-based compensation expenses included in general and administrative expenses are as follows:
Year ended March 31,
 
2013

 
2012

 
2011

Share option plan (note 24(b))
 
$
1,333

 
$
1,373

 
$
1,455

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

 
(2,878
)
 
2,878

Deferred performance share unit plan (note 24(d))
 
—

 
—

 
(44
)
Restricted share unit plan (note 24(e))
 
1,275

 
733

 
1,603

Directors' deferred stock unit plan (note 24(f))
 
997

 
(1,747
)
 
1,484

Stock award plan (note 24(g))
 
14

 
256

 
780

 
 
$
3,619

 
$
(2,263
)
 
$
8,156
Schedule of stock options activity
 
 
Number of options

 
Weighted average
exercise price
$ per share

Outstanding at March 31, 2010
 
2,250,804

 
7.84

Granted
 
260,000

 
9.77

Exercised(i)
 
(193,250
)
 
4.98

Forfeited
 
(120,080
)
 
10.30

Modified(ii)
 
(550,000
)
 
5.00

Outstanding at March 31, 2011
 
1,647,474

 
9.25

Granted
 
287,700

 
6.56

Exercised(i)
 
(8,480
)
 
4.15

Forfeited
 
(91,900
)
 
10.42

Outstanding at March 31, 2012
 
1,834,794

 
8.79

Granted
 
1,517,400

 
2.83

Forfeited
 
(366,472
)
 
9.10

Outstanding at March 31, 2013
 
2,985,722

 
5.72

(i)
All stock options exercised resulted in new common shares being issued (note 19(a));
(ii)
550,000 stock options were modified as senior executive stock options on September 22, 2010 (note 24(c)).
Summary of information about stock options outstanding
The following table summarizes information about stock options outstanding at March 31, 2013:
  
 
Options outstanding
 
 
Options exercisable
 
Exercise price
 
Number

 
Weighted
average
remaining life
 
Weighted
average exercise
price

 
Number

 
Weighted
average
remaining life

 
Weighted
average exercise
price

$2.75
 
705,600

 
9.5 years
 
$
2.75

 
—

 
—

 
—

$2.79
 
750,000

 
9.2 years
 
$
2.79

 
—

 
—

 
—

$3.69
 
115,840

 
6.4 years
 
$
3.69

 
91,700

 
6.6 years

 
$
3.69

$4.90
 
40,000

 
9 years
 
$
4.90

 
—

 
—

 
—

$5.00
 
403,982

 
1.8 years
 
$
5.00

 
403,982

 
1.8 years

 
$
5.00

$6.56
 
188,260

 
8.1 years
 
$
6.56

 
42,140

 
7.4 years

 
$
6.56

$8.28
 
80,000

 
6.2 years
 
$
8.28

 
48,000

 
6.2 years

 
$
8.28

$8.58
 
60,000

 
7.5 years
 
$
8.58

 
24,000

 
7.5 years

 
$
8.58

$9.33
 
125,560

 
6.5 years
 
$
9.33

 
79,200

 
6.6 years

 
$
9.33

$10.13
 
128,780

 
7.4 years
 
$
10.13

 
55,640

 
7.3 years

 
$
10.13

$13.21
 
75,000

 
4.8 years
 
$
13.21

 
75,000

 
4.8 years

 
$
13.21

$13.50
 
194,940

 
4.6 years
 
$
13.50

 
194,940

 
4.6 years

 
$
13.50

$15.37
 
40,000

 
5 years
 
$
15.37

 
40,000

 
5 years

 
$
15.37

$16.46
 
50,000

 
5 years
 
$
16.46

 
40,000

 
5 years

 
$
16.46

$16.75
 
27,760

 
3.5 years
 
$
16.75

 
27,760

 
3.5 years

 
$
16.75

 
 
2,985,722

 
7.1 years
 
$
5.72

 
1,122,362

 
4.2 years

 
$
8.82
Schedule of restricted share unity plan activity
  
 
Number of units

Outstanding at March 31, 2010
 
468,815

Forfeited
 
(86,339
)
Outstanding at March 31, 2011
 
382,476

Granted
 
695,086

Settled
 
(27,850
)
Forfeited
 
(102,022
)
Converted from DPSUs (note 24(d))
 
227,875

Outstanding at March 31, 2012
 
1,175,565

Granted
 
625,405

Settled
 
(345,679
)
Forfeited
 
(364,446
)
Outstanding at March 31, 2013
 
1,090,845
Share option plan
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of assumptions used to value stock option grants
The fair value of each option granted by the Company was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:
Year ended March 31,
 
2013

 
2012

 
2011

Number of options granted
 
1,517,400

 
287,700

 
260,000

Weighted average fair value per option granted ($)
 
1.88

 
4.38

 
6.79

Weighted average assumptions:
 
 
 
 
 
 
Dividend yield
 
Nil
%
 
Nil
%
 
Nil
%
Expected volatility
 
74.52
%
 
75.22
%
 
78.59
%
Risk-free interest rate
 
1.02
%
 
1.32
%
 
2.65
%
Expected life (years)
 
6.4

 
6.3

 
6.1
Senior executive stock option plan
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of assumptions used to value stock option grants
The weighted average assumptions used in estimating the fair value of the senior executive stock options as at March 31, 2013 are as follows:
Year ended March 31,
 
2013

 
2012

 
2011

Number of senior executive stock options
 
550,000

 
550,000

 
550,000

Weighted average fair value per option granted ($)
 
1.68

 
2.40

 
9.30

Weighted average assumptions:
 
 
 
 
 
 
Dividend yield
 
Nil
%
 
Nil
%
 
Nil
%
Expected volatility
 
71.74
%
 
74.99
%
 
76.74
%
Risk-free interest rate
 
0.26
%
 
0.54
%
 
1.77
%
Expected life (years)
 
2.1

 
3.1

 
6.1
Deferred performance share unit plan
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock plan activity
  
 
Number of units

Outstanding at March 31, 2010
 
507,295

Forfeited
 
(74,776
)
Outstanding at March 31, 2011
 
432,519

Expired
 
(41,117
)
Converted to RSUs (note 24(e))
 
(391,402
)
Outstanding at March 31, 2012 and 2013
 
—
Directors' deferred share unit plan
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock plan activity
  
 
Number of units

Outstanding at March 31, 2010
 
263,266

Issued
 
73,752

Outstanding at March 31, 2011
 
337,018

Issued
 
128,248

Outstanding at March 31, 2012
 
465,266

Issued
 
266,091

Redeemed
 
(63,413
)
Outstanding at March 31, 2013
 
667,944