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RELATED PARTY TRANSACTIONS - Compensation Of Key Management Personnel (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disclosure of related party transactions [Abstract]
Salaries and other short-term employee benefits	$ 6.5	$ 6.5
Post-employment benefits – defined benefit plans	1.6	2.5
Share-based payments expense	24.8	(8.8)
Key management personnel compensation	$ 32.9	$ 0.2

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- Definition

Disclosure of related party transactions [Abstract]

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

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-Number 24
-IssueDate 2020-01-01
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- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

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