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Long term debt - Notes payable (Details) | 12 Months Ended | 0 Months Ended |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 CAD | Mar. 31, 2012 CAD | Mar. 31, 2011 CAD | Apr. 28, 2010 8.75% senior notes Senior notes CAD | Apr. 28, 2010 Senior notes 8.75% senior notes CAD | Mar. 31, 2013 Senior notes 8.75% senior notes | Nov. 26, 2003 Senior notes 8.75% senior notes USD ($) | Nov. 26, 2003 Senior notes 8.75% senior notes CAD | Apr. 07, 2010 Corporate debentures Series 1 Debentures CAD | Mar. 31, 2013 Corporate debentures Series 1 Debentures On or after April 7, 2014 | Mar. 31, 2013 Corporate debentures Series 1 Debentures On or after April 7, 2015 | Mar. 31, 2013 Corporate debentures Series 1 Debentures On or after April 7, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of long term debt |  |  |  |  |  |  | $ 200,000,000 | 263,000,000 | 225,000,000 |  |  |
Redemption amount of senior notes |  |  |  | 202,410,000 |  |  |  |  |  |  |  |
Loss on debt extinguishment | 0 | 0 | 4,346,000 | 4,346,000 |  |  |  |  |  |  |  |
Write off of deferred financing costs |  |  |  | 4,324,000 | 4,324,000 |  |  |  |  |  |  |
Stated interest rate on long term debt |  |  |  |  |  | 8.75% | 8.75% | 8.75% | 9.125% |  |  |
Redemption price as a percentage of the principal amount |  |  |  |  |  |  |  |  |  | 103.042% | 101.52% | 100.00%
Redemption premium upon a change of control |  |  |  |  |  |  |  |  | 101.00% |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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