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LEASES - Schedule of Right-Of-Use Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets, beginning balance | $ 395.9 | $ 432.8
Additions and remeasurements | 26.9 | 27.3
Additions – business combinations (Note 4) | 62.6 | 1.5
Depreciation | (50.1) | (48.7)
Impairment | (9.2) |
Transfers and others | (95.8) | (26.1)
Foreign currency exchange differences | (21.8) | 9.1
Right-of-use assets, ending balance | 308.5 | 395.9
Buildings and land |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets, beginning balance | 251.9 | 241.8
Additions and remeasurements | (2.3) | 30.1
Additions – business combinations (Note 4) | 13.1 | 1.1
Depreciation | (29.0) | (25.3)
Impairment | (9.2) |
Transfers and others | 1.1 | (1.0)
Foreign currency exchange differences | (13.6) | 5.2
Right-of-use assets, ending balance | 212.0 | 251.9
Simulators |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets, beginning balance | 138.8 | 183.7
Additions and remeasurements | 0.1 | (3.4)
Additions – business combinations (Note 4) | 49.5 | 0.0
Depreciation | (17.2) | (20.1)
Impairment | 0.0 |
Transfers and others | (97.1) | (25.3)
Foreign currency exchange differences | (8.2) | 3.9
Right-of-use assets, ending balance | 65.9 | 138.8
Machinery and equipment |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets, beginning balance | 5.0 | 7.3
Additions and remeasurements | 16.1 | 0.6
Additions – business combinations (Note 4) | 0.0 | 0.0
Depreciation | (3.4) | (3.1)
Impairment | 0.0 |
Transfers and others | 0.4 | 0.2
Foreign currency exchange differences | 0.0 | 0.0
Right-of-use assets, ending balance | 18.1 | 5.0
Aircraft |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets, beginning balance | 0.2 | 0.0
Additions and remeasurements | 13.0 | 0.0
Additions – business combinations (Note 4) | 0.0 | 0.4
Depreciation | (0.5) | (0.2)
Impairment | 0.0 |
Transfers and others | (0.2) | 0.0
Foreign currency exchange differences | 0.0 | 0.0
Right-of-use assets, ending balance | $ 12.5 | $ 0.2

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_h&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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