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LEASES - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disclosure of finance lease and operating lease by lessee [line items] |  |
Depreciation method, right-of-use assets | $ 50.1 | $ 48.7
Short-term lease, low-value assets, and variable lease payments expenses | 19.5 | 16.3
Net book value of property, plant and equipment leased under operating lease to third parties | 58.2 | 72.8
Cost of sales |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Depreciation method, right-of-use assets | 47.8 | 47.0
Selling, general and administrative expenses |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Depreciation method, right-of-use assets | $ 2.3 | $ 1.7

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- Details
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