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Goodwill and Intangible Assets - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 CAD ($) Multiple | Dec. 31, 2019 CAD ($) Multiple
Disclosure of detailed information about intangible assets [Line Items] |  |
Impairment loss recognised in profit or loss good will | $ | $ 0 | $ 0
Price-to-earnings multiples | Multiple | 10.7 | 10.3
Canada [member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Tax rate applied to cash flow projections | 26.50% | 26.50%
U.S. [member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Tax rate applied to cash flow projections | 21.00% | 21.00%
Japan [Member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Tax rate applied to cash flow projections | 28.00% | 28.00%
Bottom of range [Member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Growth rate used to extrapolate cash flow projections | 0.00% | 0.00%
After-tax discount rate applied to cash flow projections | 8.00% | 7.50%
Pre-tax discount rate applied to cash flow projections | 10.00% | 9.40%
Top of range [Member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Growth rate used to extrapolate cash flow projections | 10.00% | 20.00%
After-tax discount rate applied to cash flow projections | 10.00% | 10.00%
Pre-tax discount rate applied to cash flow projections | 12.50% | 12.50%

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- Definition The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_d_iv&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_e_iv&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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