GOVERNMENT PARTICIPATION (Details) - CAD ($) $ in Millions	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Disclosure of Government Grants [Line Items]
Credited to non-financial assets	$ 14.6	$ 11.7
Credited to income	19.5	20.2
Total contributions	34.1	31.9
Government contributions relating to Covid-19	14.9	160.5
Non-financial assets, government contributions relating to Covid-19	1.3	33.1
Income, government contributions relating to Covid-19	$ 13.6	$ 127.4
Government of Canada
Disclosure of Government Grants [Line Items]
Notional amount			$ 190.0
Government of Québec
Disclosure of Government Grants [Line Items]
Notional amount			$ 150.0

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Disclosure of Government Grants [Line Items]

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Government Contributions Relating To COVID-19

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Government Contributions Relating To COVID-19, Income Impacts

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Government Participation, Contributions

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Non-Financial Assets, Government Contributions Relating To COVID-19

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of income recognised in relation to government grants. [Refer: Government grants]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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