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Stock-based compensation (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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