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Stock-based compensation - Textuals (Details) (CAD) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended |  |  |  |  | 12 Months Ended |  |  |  |
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2013 Share option plan | Mar. 31, 2012 Share option plan | Mar. 31, 2011 Share option plan | Mar. 31, 2013 Share option plan Stock options | Mar. 31, 2012 Share option plan Stock options | Sep. 22, 2010 Senior executive stock option plan | Mar. 31, 2013 Deferred performance share unit plan Deferred performance share units (DPSUs) | Mar. 31, 2012 Deferred performance share unit plan Deferred performance share units (DPSUs) | Apr. 02, 2011 Deferred performance share unit plan Deferred performance share units (DPSUs) April 1, 2009 | Apr. 02, 2011 Deferred performance share unit plan Deferred performance share units (DPSUs) March 31, 2010 | Mar. 31, 2013 Restricted share unit plan Restricted share units (RSUs) | Mar. 31, 2012 Restricted share unit plan Restricted share units (RSUs) | Apr. 30, 2013 Restricted share unit plan Restricted share units (RSUs) Subsequent event | Mar. 31, 2013 Restricted share unit plan Restricted share units (RSUs) Accrued liabilities | Mar. 31, 2012 Restricted share unit plan Restricted share units (RSUs) Accrued liabilities | Mar. 31, 2013 Restricted share unit plan Restricted share units (RSUs) Other long-term liabilities | Mar. 31, 2012 Restricted share unit plan Restricted share units (RSUs) Other long-term liabilities | Mar. 31, 2013 Directors' deferred share unit plan Deferred stock units (DSUs) | Mar. 31, 2012 Directors' deferred share unit plan Deferred stock units (DSUs) | Mar. 31, 2013 Directors' deferred share unit plan Deferred stock units (DSUs) Accrued liabilities | Mar. 31, 2012 Directors' deferred share unit plan Deferred stock units (DSUs) Accrued liabilities | Mar. 31, 2013 Directors' deferred share unit plan Deferred stock units (DSUs) Other long-term liabilities | Mar. 31, 2012 Directors' deferred share unit plan Deferred stock units (DSUs) Other long-term liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number shares acquired per each option exercised |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Years from grant date stock options expire |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options annual vesting percentage |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock options exercised | 0 | 35,000 | 963,000 | 0 | 35,000 | 963,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  | 0 | 48,000 | 1,084,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, weighted average remaining life |  |  |  | 7 years 1 month 6 days | 6 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of options vested during the year |  |  |  | 1,381,000 | 1,652,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options exercisable |  |  |  | 1,122,362 | 1,031,774 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable, weighted average exercise price |  |  |  | 8.82 | 8.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation costs related to non-vested awards not yet recognized |  |  |  | 2,768,000 | 2,655,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation costs related to non-vested awards not yet recognized, weighted average recognition period |  |  |  |  |  |  | 3 years 7 months 6 days | 3 years 2 months 12 days |  |  |  |  |  | 1 year 7 months 6 days | 1 year 4 months 24 days |  |  |  |  |  |  |  |  |  |  |
Stock options reclassified from equity to a long-term liability |  |  |  |  |  |  |  |  | 550,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost related to the senior executive stock option plan transferred from additional paid-in capital to the senior executive stock option liability |  |  |  |  |  |  |  |  | 2,237,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service period of award subsequent to year of grant |  |  |  |  |  |  |  |  |  | 2 years |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 3 years |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days used to determine weighted average trading price of common shares |  |  |  |  |  |  |  |  |  | 5 days |  |  |  | 5 days |  |  |  |  |  |  | 5 days |  |  |  |  |
Converted to (units) |  |  |  |  |  |  |  |  |  |  | 391,402 | 262,737 | 128,665 |  |  |  |  |  |  |  |  |  |  |  |  |
RSU conversion factor |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of award obligation |  |  |  |  |  |  |  |  |  |  |  |  |  | 719,000 | 2,066,000 |  | 719,000 | 2,066,000 |  |  | 355,000 | 0 | 355,000 | 0 |  |
Non-current portion of award obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,049,000 | 1,104,000 |  |  |  |  | 2,751,000 | 2,284,000
Award units settled during the period (units) |  |  |  |  |  |  |  |  |  |  |  |  |  | 345,679 | 27,850 |  |  |  |  |  | 63,413 | 0 |  |  |  |
Award units settled during the period |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,677,000 | 318,000 |  |  |  |  |  | 175,000 |  |  |  |  |
Award units fully vested but unsettled |  |  |  |  |  |  |  |  |  |  |  |  |  | 154,330 |  |  |  |  |  |  |  |  |  |  |  |
Award unit redemption value (CAD per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.66 |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of award |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days | 1 year 4 months 24 days |  |  |  |  |  |  |  |  |  |  |
Fair market value (CAD per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.65 |  |  |  |  |  |  | 4.65 | 4.91 |  |  |  |
Total unrecognized compensation costs related to non-vested share-based payment arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,335,000 | 2,576,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of non-officer directors' fixed remuneration in the form of DDSUs (50% or more) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |

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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + 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 (d)(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 A240 -Subparagraph c(2) -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 Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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