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Employee Benefit Plans (Details)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
USD ($)
plan
Dec. 29, 2018
USD ($)
Dec. 30, 2017
USD ($)
Fair Value Measurement [Domain]      
Change in plan assets:      
Fair value of plan assets at beginning of period $ 133,861    
Fair value of plan assets at end of period 155,702 $ 133,861  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 85,639    
Fair value of plan assets at end of period 104,189 85,639  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 6,299    
Fair value of plan assets at end of period 5,792 6,299  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 3,337    
Fair value of plan assets at end of period 4,474 3,337  
Projected benefit obligation at beginning of period 190,666 204,728  
Service cost 2,696 3,064 $ 3,043
Interest cost 6,828 6,443 6,711
Employee contributions 368 410  
Employee contributions 368 410  
Actuarial loss/(gain) 20,927 (12,235)  
Benefits paid (8,120) (7,799)  
Effect of curtailment (43) (474)  
Effect of settlement (903) (280)  
Other (154) (3,191)  
Projected benefit obligation at end of period 212,265 190,666 204,728
Fair value of plan assets at beginning of period 133,861 150,517  
Actual return on plan assets 26,014 (11,922)  
Employer contributions 4,343 4,538  
Benefits paid (8,120) (7,799)  
Effect of settlement (903) (331)  
Other 139 (1,552)  
Fair value of plan assets at end of period 155,702 133,861 150,517
Funded status (56,563) (56,805)  
Amounts recognized in the consolidated balance sheets consist of:      
Current liability (1,072) (1,173)  
Noncurrent liability (55,491) (55,632)  
Net amount recognized (56,563) (56,805)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 45,062 47,501  
Prior service cost 295 351  
Net amount recognized [1] 45,357 47,852  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax 11,400 12,300  
Accumulated benefit obligation 201,708 181,642  
Net pension cost includes the following components:      
Service cost 2,696 3,064 3,043
Interest cost 6,828 6,443 6,711
Expected return on plan assets (7,270) (8,226) (7,181)
Net amortization and deferral 4,605 3,578 4,821
Curtailment (33) (263) 0
Settlement 66 47 42
Net pension cost 6,892 4,643 7,436
Amounts recognized in accumulated other comprehensive income (loss):      
Amortization of actuarial loss 3,428 2,633 2,985
Actuarial (loss)/gain recognized (1,991) (5,886) 2,763
Amortization of settlement 50 (2) 27
Amortization of prior service costs 25 26 24
Amortization of curtailment 0 498  
Other 16 9 30
Pension adjustments 1,535 $ (2,730) $ 5,829
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension cost in fiscal 2012:      
Net actuarial loss 3,417    
Prior service cost 33    
Total $ 3,450    
Weighted average assumptions used to determine benefit obligations:      
Discount rate 2.77% 3.68% 3.40%
Rate of compensation increase 0.40% 0.42% 0.38%
Weighted average assumptions used to determine net periodic benefit cost for the employee benefit pension plans:      
Discount rate 3.33% 2.30% 3.49%
Rate of increase in future compensation levels 0.42% 0.36% 0.43%
Expected long-term rate of return on assets 6.13% 6.13% 6.17%
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2020 $ 10,546    
2021 10,498    
2022 10,754    
2023 10,675    
2024 11,892    
Years 2025 – 2029 64,147    
Multiemployer Plans [Abstract]      
Contributions $ 3,626 $ 3,547 $ 3,472
Number Of Multiemployer Plans, Withdrawal Obligation | plan 5    
Multiemployer Plans, Withdrawal Obligation $ 6,000    
Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 3,337 3,375  
Fair value of plan assets at end of period 4,474 3,337 3,375
Western Conference Of Teamsters Pension Plan [Member]      
Multiemployer Plans [Abstract]      
Contributions [2] 1,514 1,505 1,524
Central States, Southeast and Southwest Areas Pension Plan [Member]      
Multiemployer Plans [Abstract]      
Contributions [3],[4] 916 978 968
Other Multiemployer Plans [Member]      
Multiemployer Plans [Abstract]      
Contributions $ 1,196 1,064 $ 980
Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Multiemployer Plan, Contributions To Individual Plan, Percent 5.00%    
Estimate of Fair Value Measurement [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period $ 95,275    
Fair value of plan assets at end of period 114,455 95,275  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 85,639    
Fair value of plan assets at end of period 104,189 85,639  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 6,299    
Fair value of plan assets at end of period 5,792 6,299  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 3,337    
Fair value of plan assets at end of period 4,474 3,337  
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 21,670    
Fair value of plan assets at end of period 16,154 21,670  
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 21,670    
Fair value of plan assets at end of period 16,154 21,670  
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Fixed Income, Short Term [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 2,032    
Fair value of plan assets at end of period 3,448 2,032  
Estimate of Fair Value Measurement [Member] | Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 2,032    
Fair value of plan assets at end of period 3,448 2,032  
Estimate of Fair Value Measurement [Member] | Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Equity Securities, Domestic [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 37,223    
Fair value of plan assets at end of period 52,420 37,223  
Estimate of Fair Value Measurement [Member] | Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 37,223    
Fair value of plan assets at end of period 52,420 37,223  
Estimate of Fair Value Measurement [Member] | Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Equity Securities, International [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 24,714    
Fair value of plan assets at end of period 32,167 24,714  
Estimate of Fair Value Measurement [Member] | Equity Securities, International [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 24,714    
Fair value of plan assets at end of period 32,167 24,714  
Estimate of Fair Value Measurement [Member] | Equity Securities, International [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Equity Securities, International [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Insurance Contracts [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 9,636    
Fair value of plan assets at end of period 10,266 9,636  
Estimate of Fair Value Measurement [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 0    
Fair value of plan assets at end of period 0 0  
Estimate of Fair Value Measurement [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 6,299    
Fair value of plan assets at end of period 5,792 6,299  
Estimate of Fair Value Measurement [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 3,337    
Fair value of plan assets at end of period 4,474 3,337  
Portion at Other than Fair Value Measurement [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 38,586    
Fair value of plan assets at end of period $ 41,247 $ 38,586  
[1]
Amounts do not include deferred taxes of $11.4 million and $12.3 million at December 28, 2019 and December 29, 2018, respectively.
[2]
The Company has several plants that participate in the Western Conference of Teamsters Pension Plan under collective bargaining agreements that require minimum funding contributions. The agreements have expiration dates through December 31, 2023.
[3]
The Company has several processing plants that participate in the Central States, Southeast and Southwest Areas Pension Plan under collective bargaining agreements that require minimum funding contributions. Certain of these agreements have expired and are being renegotiated with others having expiration dates through August 2, 2022.
[4] In July 2005 this plan received a 10 year extension from the IRS for amortizing unfunded liabilities.