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Other assets - Deferred financing costs (Details) (CAD) | 12 Months Ended |  | 0 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2013 Interest expense | Mar. 31, 2012 Interest expense | Mar. 31, 2011 Interest expense | Mar. 31, 2013 Term and Revolving Facilities Credit facilities | Mar. 31, 2012 Term and Revolving Facilities Credit facilities | Mar. 31, 2011 Term and Revolving Facilities Credit facilities | Mar. 31, 2013 Series 1 Debentures Corporate debentures | Mar. 31, 2012 Series 1 Debentures Corporate debentures | Mar. 31, 2011 Series 1 Debentures Corporate debentures | Apr. 07, 2010 Series 1 Debentures Corporate debentures | Apr. 28, 2010 8.75% senior notes Senior notes | Mar. 31, 2013 8.75% senior notes Senior notes | Nov. 26, 2003 8.75% senior notes Senior notes | Apr. 25, 2010 8.75% senior notes Senior notes Interest expense
Deferred financing costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | 12,747,000 | 12,308,000 |  |  |  |  | 5,861,000 | 5,422,000 |  | 6,886,000 | 6,886,000 |  |  |  |  |  |
Accumulated Amortization | 7,774,000 | 6,167,000 |  |  |  |  | 5,384,000 | 4,652,000 |  | 2,390,000 | 1,515,000 |  |  |  |  |  |
Net Book Value | 4,973,000 | 6,141,000 |  |  |  |  | 477,000 | 770,000 |  | 4,496,000 | 5,371,000 |  |  |  |  |  |
Financing fees incurred in connection with debt modification |  |  |  |  |  |  | 439,000 | 60,000 | 1,034,000 |  |  |  |  |  |  |  |
Financing fees incurred in connection with debt issuance |  |  |  |  |  |  |  |  |  | 0 | 0 | 5,846,000 |  |  |  |  |
Amortization of deferred financing costs | 1,607,000 | 1,591,000 | 1,609,000 | 1,607,000 | 1,591,000 | 1,609,000 |  |  |  |  |  |  |  |  |  |  | 183,000
Stated interest rate on long term debt |  |  |  |  |  |  |  |  |  |  |  |  | 9.125% |  | 8.75% | 8.75% |
Unamortized deferred financing costs expensed upon redemption of notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,324,000 |  |  |

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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