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DEBT FACILITIES - Retirement Payments (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items] |  |
Required payments related to retirement provisions, long-term debt, gross | $ 1,117.5 | $ 1,084.9
Required payments related to retirement provisions, long-term debt, transaction costs | (2.0) | (2.8)
Required payments related to retirement provisions, long-term debt, net | 1,115.5 | 1,082.1
No later than 1 year |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Required payments related to retirement provisions, long-term debt, gross | 35.6 | 31.9
Later than 1 year and no later than 5 years |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Required payments related to retirement provisions, long-term debt, gross | 450.2 | 414.8
Later than 5 years |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |
Required payments related to retirement provisions, long-term debt, gross | $ 631.7 | $ 638.2

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