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Tax - Factors That May Affect The Future Tax Charge - Additional Information (Detail) | 12 Months Ended
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Apr. 01, 2020 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of income tax reconciliation [Line Items] |  |  |  |
Corporate income tax rate |  | 19.25% | 20.00% | 20.25%
United Kingdom [member] | Changes in tax rates or tax laws enacted or announced [member] |  |  |  |
Disclosure of income tax reconciliation [Line Items] |  |  |  |
Corporate income tax rate | 17.00% |  |  |
United States [member] |  |  |  |
Disclosure of income tax reconciliation [Line Items] |  |  |  |
Corporate income tax rate |  | 35.00% |  |
United States [member] | Effective 1 January 2018 [Member] |  |  |  |
Disclosure of income tax reconciliation [Line Items] |  |  |  |
Corporate income tax rate |  | 21.00% |  |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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