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Long term debt (Details) (CAD) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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Long-term Debt, Current Maturities [Abstract] |  |
Long term debt, current | 21,409 | 14,402
Long-term Debt, Excluding Current Maturities [Abstract] |  |
Long term debt noncurrent | 290,655 | 300,066
Term and Revolving Facilities |  |
Long-term Debt, Current Maturities [Abstract] |  |
Long term debt, current | 9,392 | 10,000
Long-term Debt, Excluding Current Maturities [Abstract] |  |
Long term debt noncurrent | 35,850 | 68,767
Capital lease obligations |  |
Long-term Debt, Current Maturities [Abstract] |  |
Long term debt, current | 12,017 | 4,402
Long-term Debt, Excluding Current Maturities [Abstract] |  |
Long term debt noncurrent | 29,805 | 6,299
Corporate debentures |  |
Long-term Debt, Excluding Current Maturities [Abstract] |  |
Long term debt noncurrent | 225,000 | 225,000

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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