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Intangible Assets And Goodwill - Summary of Net Change in Goodwill(Details) - CAD ($) $ in Thousands	12 Months Ended
	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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Disposal of consolidated entity goodwill.

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The increase (decrease) in goodwill. [Refer: Goodwill]

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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

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