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INCOME TAXES - Components of the Provision for the Income Tax Expense (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax [Abstract]
Current year	$ 8.6	$ 65.1
Prior years' tax adjustments	(15.0)	5.8
Tax benefit not previously recognized used to reduce the deferred tax expense	(5.2)	(2.8)
Change in income tax rates	(0.8)	(1.0)
Origination and reversal of temporary differences	(27.3)	6.7
Income tax (recovery) expense	$ (39.7)	$ 73.8

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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. [Refer: Current tax expense (income); Deferred tax expense (income)]

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