Post-Retirement Health Care Post-Retirement Health Care - Valuation Assumptions (Details)	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.80%	2.40%	3.20%

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

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)(1)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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