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Multipemployer Pension and Postretirement Plans Multiemployer Pension Plans Trusts Funds (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Multiemployer Plans [Line Items] |  |  |  |
Contributions |  | $ 7.0 | $ 8.7 | $ 10.4
Bakery And Confectionary Union And Industry International Pension Fund [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Funding improvement or rehabilitation plan implementation status, insignificant | [1] | Implemented |  |
Contributions, insignificant | [1] | $ 5.9 | $ 5.9 | 6.5
Surcharge imposed, insignificant | [1] | Yes |  |
Multiemployer Plan, Pension, Insignificant, Employees Covered by Collective-Bargaining Arrangement to All Entity's Employees, Percentage |  | 80.00% |  |
Plan number, insignificant | [1] | 001 |  |
Certified zone status, insignificant | [1] | Red | Red |
Certified zone status date, insignificant | [1] | Dec. 31, 2019 | Dec. 31, 2018 |
Multiemployer Plan, Pension, Insignificant, Collective-Bargaining Arrangement, Expiration Date | [1],[2] | Mar. 16, 2021 |  |
Employer Identification Number, insignificant | [1] | 526118572 |  |
Bakery And Confectionary Union And Industry International Pension Fund [Member] | Minimum |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer Plan, Pension, Insignificant, Collective-Bargaining Arrangement, Expiration Date | [1],[2] | Dec. 17, 2020 |  |
Bakery And Confectionary Union And Industry International Pension Fund [Member] | Maximum |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer Plan, Pension, Insignificant, Collective-Bargaining Arrangement, Expiration Date | [1],[2] | Mar. 16, 2021 |  |
Central States Southeast And Southwest Areas Pension Fund [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Funding improvement or rehabilitation plan, implementation status, significant |  | Implemented |  |
Surcharge imposed, significant |  | Yes |  |
Contributions, significant |  | $ 0.0 | $ 1.3 | 1.9
Plan number, significant |  | 001 |  |
Certified zone status, significant |  | Red | Red |
Certified zone status date, significant |  | Dec. 31, 2019 | Dec. 31, 2018 |
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date | [3] |  |  |
Employer Identification Number, significant |  | 366044243 |  |
Western Conference Of Teamsters Pension Trust [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Funding improvement or rehabilitation plan implementation status, insignificant |  | NA |  |
Contributions, insignificant |  | $ 0.9 | $ 0.8 | 1.0
Surcharge imposed, insignificant |  | No |  |
Plan number, insignificant |  | 001 |  |
Certified zone status, insignificant |  | Green | Green |
Certified zone status date, insignificant |  | Dec. 31, 2019 | Dec. 31, 2018 |
Multiemployer Plan, Pension, Insignificant, Collective-Bargaining Arrangement, Expiration Date | [4] | Mar. 26, 2022 |  |
Employer Identification Number, insignificant |  | 916145047 |  |
Other Plans [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Contributions, insignificant |  | $ 0.2 | $ 0.7 | $ 1.0
Multiemployer Plan, Pension, Insignificant, Collective-Bargaining Arrangement, Expiration Date | [5] |  |  |
[1] | The Company is party to multiple CBAs requiring contributions to this fund, each with its own expiration date. Over 80 percent of the Company’s participants in this fund are covered by a single CBA that expires on 4/16/2021.
[2] | The Company does not expect 2021 contributions to be materially different than 2020.
[3] | During 2019, the Company terminated CBAs covered by this fund. As a result, the Company has withdrawn from the fund and recognized expense for its estimated withdrawal liability. The Company does not expect to make 2021 contributions.
[4] | The Company does not expect 2021 contributions to be materially different than 2020.
[5] | During 2019, the Company terminated the CBAs covered by certain of these funds. As a result, for the impacted funds, the Company recognized expense for the estimated withdrawal liability in each year and no longer made contributions following the termination. The Company does not expect 2021 contributions to the remaining funds to be materially different from 2020.

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- Definition Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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