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Defined Benefit Plans - Summary of Actuarial Assumptions Used to Determine Defined Benefit Obligations (Parenthetical) (Detail) - Counterparty | Dec. 31, 2019 | Dec. 31, 2017
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Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
White collar jobs percentage | 90.00% |
Blue collar jobs percentage | 10.00% |
Top of range [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Club Vita tables Scheme membership CMI |  | 0.0150
Bottom of range [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Club Vita tables Scheme membership CMI |  | 0.0125
Remeasurement of defined benefit Plans of group companies [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Discount rate | 3.23% |
Post retirement welfare plan [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Discount rate | 3.02% |

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- Definition Blue Collar Jobs Percentage + References No definition available. + Details
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- Definition White collar jobs percentage. + References No definition available. + Details
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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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