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RELATED PARTY TRANSACTIONS - Compensation Of Key Management Personnel (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure of related party transactions [Abstract] |  |
Salaries and other short-term employee benefits | $ 7.0 | $ 7.1
Post-employment benefits – defined benefit plans | 1.8 | 1.3
Share-based payments | 17.8 | 16.8
Key management personnel compensation | $ 26.6 | $ 25.2

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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17&doctype=Standard -URIDate 2017-03-09 + Details
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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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17_b&doctype=Standard -URIDate 2017-03-09 + Details
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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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17_e&doctype=Standard -URIDate 2017-03-09 + Details
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