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INCOME TAXES - Components of the Provision for the Income Tax Expense (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax [Abstract]
Current period	$ 53.8	$ 21.0
Adjustment for prior years	11.0	(12.2)
Tax benefit not previously recognized used to reduce the deferred tax expense	(18.7)	(17.2)
Impact of change in income tax rates on deferred income taxes	(32.8)	0.4
Origination and reversal of temporary differences	15.8	43.2
Income tax expense	$ 29.1	$ 35.2

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Income Tax [Abstract]

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Adjustments of tax expense (income) recognised in the period for current tax of prior periods.

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The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)]

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The amount of deferred tax expense or income relating to tax rate changes or the imposition of new taxes. [Refer: Deferred tax expense (income)]

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)]

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