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Investment in and advances to unconsolidated joint venture (Details) (CAD) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Mar. 25, 2011 joint_venture_partner
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds on the wind up of the JV |  | 2,170,000 | 0 | 0 |
Investment in and advances to unconsolidated joint venture |  | 0 | 1,574,000 |  |
Condensed financial data for investment in and advances to unconsolidated joint venture [Abstract] |  |  |  |  |
Equity in (earnings) loss of unconsolidated joint venture (note 9) |  | (596,000) | (86,000) | 2,720,000 |
Noramac Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proportionate interest in Noramac Joint Venture (percent) |  |  |  |  | 50.00%
Ownership interest in Noramac Ventures (percent) |  |  |  |  | 49.00%
Number of joint venture partners |  |  |  |  | 2
Proceeds on the wind up of the JV | 2,170,000 |  |  |  |
Investment in and advances to unconsolidated joint venture |  | 0 | 1,574,000 |  |
Condensed financial data for investment in and advances to unconsolidated joint venture [Abstract] |  |  |  |  |
Current assets |  | 0 | 6,556,000 |  |
Current liabilities |  | 0 | 10,716,000 |  |
Gross revenues |  | 1,192,000 | 1,922,000 | 12,196,000 |
Gross (profit) loss |  | (1,192,000) | (1,922,000) | 2,483,000 |
Net (income) loss |  | (1,192,000) | (172,000) | 5,440,000 |
Equity in (earnings) loss of unconsolidated joint venture (note 9) |  | (596,000) | (86,000) | 2,720,000 |

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph 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. + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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