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Employee Benefit Plan - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Mar. 30, 2019
Employees Benefit [Abstract] |  |
Individual contributions under defined contribution pension plan | 2.00% | 5.00%
Total expense under the defined contribution plan | $ 6 | $ 13

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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_53&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Defined contribution plans percentage + References No definition available. + Details
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- Definition Employees Benefit [abstract] + References No definition available. + Details
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