Assumptions Used in Calculating Funded Status (Detail) - United Kingdom	12 Months Ended
Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	3.47%	2.03%	1.64%
Discount rate	5.00%	1.80%	1.40%
Inflation	3.00%	3.20%	2.70%

Defined benefit plan assumptions used calculating net periodic benefit cost rate of inflation

No definition available.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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