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Other long term obligations (Details) (CAD) | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Other Liabilities, Noncurrent [Abstract] |  |  |
Liabilities related to equipment leases | 104,000 | 3,169,000 |
Deferred lease inducements (note 18(b)) | 440,000 | 547,000 |
Asset retirement obligation (note 18(c)) | 477,000 | 434,000 | 395,000
Other obligations, current and noncurrent | 7,820,000 | 10,926,000 |
Less current portion of: |  |  |
Other obligations, noncurrent portion | 6,746,000 | 8,860,000 |
Lease Incentive, Payable [Roll Forward] |  |  |
Balance, beginning of year | 547,000 | 654,000 |
Amortization of deferred lease inducements | (107,000) | (107,000) |
Balance, end of year | 440,000 | 547,000 | 654,000
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Balance, beginning of year | 434,000 | 395,000 |
Accretion expense | 43,000 | 39,000 | 35,000
Balance, end of year | 477,000 | 434,000 | 395,000
Estimated undiscounted cash flows required to settle obligation | 1,084,000 | 1,084,000 |
Credit adjusted risk-free rate assumed in measuring the asset retirement obligation | 9.42% |  |
Stock options | Senior executive stock option plan |  |  |
Other Liabilities, Noncurrent [Abstract] |  |  |
Deferred compensation plans | 925,000 | 1,322,000 |
Restricted share units (RSUs) | Restricted share unit plan |  |  |
Other Liabilities, Noncurrent [Abstract] |  |  |
Deferred compensation plans | 2,768,000 | 3,170,000 |
Less current portion of: |  |  |
Deferred compensation plans, current | (719,000) | (2,066,000) |
Deferred stock units (DSUs) | Directors' deferred share unit plan |  |  |
Other Liabilities, Noncurrent [Abstract] |  |  |
Deferred compensation plans | 3,106,000 | 2,284,000 |
Less current portion of: |  |  |
Deferred compensation plans, current | (355,000) | 0 |

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for contractual rent under lease arrangements. + 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 210.5-02.24) -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 24 -Article 5 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 3, 10, 22 -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 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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