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CAPITAL RISK MANAGEMENT (Details) $ in Millions	Mar. 31, 2018 CAD ($)	Apr. 01, 2017 CAD ($)	Mar. 31, 2017 CAD ($)	Mar. 31, 2016 CAD ($)
Capital Risk Management [Abstract]
Long-term debt	$ 1,260.9		$ 1,255.4
Less: cash and cash equivalents	(611.5)		(504.7)	$ (485.6)
Net debt	649.4		750.7
Equity	2,366.6	$ 2,012.3	2,081.0	$ 1,940.3
Total net debt plus equity	$ 3,016.0		$ 2,831.7
Net debt: equity	0.2744		0.3607

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Capital Risk Management [Abstract]

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Long-term Debt, Gross

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Net Debt to Equity Ratio

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Non-Current Borrowings, Less Cash and Cash Equivalents

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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