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INVENTORIES - Narrative (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Inventories [Abstract]
Cost of inventories recognised as expense during period	$ 394.9	$ 500.3
Impairment of inventories to net realizable value	$ 34.0	$ 6.4

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- Definition

Inventories [Abstract]

+ References

No definition available.

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- Definition

Adjustments for impairment loss (reversal of impairment loss) on inventories recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Impairment loss; Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss; Impairment loss (reversal of impairment loss) recognised in profit or loss]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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- Definition

The amount of inventories recognised as an expense during the period. [Refer: Inventories]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 2
-IssueDate 2020-01-01
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