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Intangible Assets And Goodwill - Summary of Net Change in Goodwill(Details) - CAD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure Of Intangible Assets [Line Items] |  |
Beginning balance | $ 241,371 | $ 20,866
Exchange differences | 653 | 191
Ending balance | 314,923 | 241,371
Disposal of consolidated entity | (2,259) |
Joint Operations |  |
Disclosure Of Intangible Assets [Line Items] |  |
Additions from acquisitions | 36,400 |
Subsidiaries |  |
Disclosure Of Intangible Assets [Line Items] |  |
Additions from acquisitions | $ 38,758 | $ 220,314

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- Definition The increase (decrease) in goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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