Events after the Reporting Period - Additional Information (Detail) - Dividend transaction [member]	Feb. 21, 2018 CAD / shares
Disclosure of non-adjusting events after reporting period [Line Items]
Dividends payable declared date	Feb. 21, 2018
Dividends payable amount per share	CAD 0.1375
Dividend payable date	Apr. 12, 2018
Dividends payable record date	Mar. 29, 2018

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 137
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_137_a&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration