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IMPAIRMENT OF NONFINANCIAL ASSETS - Changes In Goodwill (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disclosure of reconciliation of changes in goodwill [line items] |  |
Acquisition of subsidiaries | $ 119.5 | $ 29.1
Disposal and remeasurement of interest in investment | (10.9) |
Exchange differences | 25.9 | 0.1
Goodwill |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill, start | 560.0 | 556.6
Acquisition of subsidiaries | 57.6 | 4.9
Disposal and remeasurement of interest in investment | (10.9) |
Exchange differences | 18.8 | (1.5)
Goodwill, end | 625.5 | 560.0
Goodwill | Civil Aviation Training Solutions |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill, start | 194.0 | 197.6
Acquisition of subsidiaries | 57.6 | 3.3
Disposal and remeasurement of interest in investment | (10.9) |
Exchange differences | 26.1 | (6.9)
Goodwill, end | 266.8 | 194.0
Goodwill | Defense and Security |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill, start | 220.5 | 216.9
Acquisition of subsidiaries | 0.0 | 1.6
Disposal and remeasurement of interest in investment | 0.0 |
Exchange differences | (3.0) | 2.0
Goodwill, end | 217.5 | 220.5
Goodwill | Healthcare |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Goodwill, start | 145.5 | 142.1
Acquisition of subsidiaries | 0.0 | 0.0
Disposal and remeasurement of interest in investment | 0.0 |
Exchange differences | (4.3) | 3.4
Goodwill, end | $ 141.2 | $ 145.5

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- Definition The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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