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Financial instruments and risk management - Derivatives (Details) (CAD) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended |  |  | 12 Months Ended |  |
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Apr. 08, 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 | Mar. 31, 2013 Not designated as hedging instrument | Mar. 31, 2012 Not designated as hedging instrument | Mar. 31, 2011 Not designated as hedging instrument | Mar. 31, 2013 Not designated as hedging instrument Cross-currency and interest rate swaps | Mar. 31, 2012 Not designated as hedging instrument Cross-currency and interest rate swaps | Mar. 31, 2011 Not designated as hedging instrument Cross-currency and interest rate swaps | Mar. 31, 2013 Not designated as hedging instrument Supplier contracts Embedded price escalation features | Mar. 31, 2012 Not designated as hedging instrument Supplier contracts Embedded price escalation features | Mar. 31, 2011 Not designated as hedging instrument Supplier contracts Embedded price escalation features | Mar. 31, 2013 Not designated as hedging instrument Construction contracts Embedded price escalation features | Mar. 31, 2012 Not designated as hedging instrument Construction contracts Embedded price escalation features | Mar. 31, 2011 Not designated as hedging instrument Construction contracts Embedded price escalation features | Mar. 31, 2013 Not designated as hedging instrument Level 2 Measured on recurring basis Supplier contracts Embedded price escalation features | Mar. 31, 2012 Not designated as hedging instrument Level 2 Measured on recurring basis Supplier contracts Embedded price escalation features
Derivative Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,441 | 9,146
Derivative Liabilities, Current | (4,261) | (3,220) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,261) | (3,220)
Derivative Liabilities, Noncurrent | 2,180 | 5,926 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,180 | 5,926
Settlement amount of the cross-currency and interest rate swaps | 0 | 0 | 91,125 | 91,125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on long term debt |  |  |  |  | 8.75% | 8.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives and Commodity Contracts [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives | (2,705) | (2,382) | (2,305) |  |  |  | 2,705 | 2,382 | 2,305 | 0 | 0 | 2,111 | (2,705) | 3,495 | (3,812) | 0 | (5,877) | (604) |  |

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