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TAXATION - Reconciliation (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Income taxes [Abstract] |  |
Income (loss) before income taxes and non-controlling interest | $ (82,938) | $ 246,687
Combined Canadian basic federal and provincial income tax rate | 26.50% | 26.50%
Income tax expense based on combined Canadian basic federal and provincial income tax rate | $ (21,979) | $ 65,372
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |
Adjustments in respect of current income tax of previous periods | 3,309 | 603
Non-taxable items net of non-deductible items | (3,848) | (14,391)
Unrecognized assets | (31,343) | 12,001
Income taxed at different rates and statutory rate changes | (462) | (8,843)
Manufacturing and processing allowance and all other items | (637) | (2,236)
At the effective income tax rate of 66.3% (March 31, 2024 – 21%) | (54,960) | 52,506
Income tax expense (recovery) reported in the consolidated statements of income (loss): |  |
Current tax expense | 29,586 | 82,421
Deferred tax recovery | (84,546) | (29,915)
At the effective income tax rate of 66.3% (March 31, 2024 – 21%) | (54,960) | 52,506
Deferred tax related to items charged or credited directly to equity and goodwill: |  |
Gain (loss) on revaluation of cash flow hedges | 6,524 | (2,212)
Opening deferred tax of acquired company | (15,160) | (10,963)
Other items recognized through equity | 347 | 6,215
Income tax charged directly to equity and goodwill | $ (8,289) | $ (6,960)

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