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Employee Benefit Plans (Details)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
USD ($)
plan
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Fair Value Measurement [Domain]      
Change in plan assets:      
Fair value of plan assets at beginning of period $ 150,517    
Fair value of plan assets at end of period 133,861 $ 150,517  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 97,425    
Fair value of plan assets at end of period 85,639 97,425  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 6,501    
Fair value of plan assets at end of period 6,299 6,501  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 3,375    
Fair value of plan assets at end of period 3,337 3,375  
Projected benefit obligation at beginning of period 204,728 189,290  
Service cost 3,064 3,043 $ 2,549
Interest cost 6,443 6,711 6,950
Employee contributions 410 436  
Employee contributions 410 436  
Plan amendments 0 (8)  
Actuarial loss/(gain) (12,235) 8,051  
Benefits paid (7,799) (7,063)  
Effect of curtailment (474) 0  
Effect of settlement (280) (884)  
Other (3,191) 5,152  
Projected benefit obligation at end of period 190,666 204,728 189,290
Fair value of plan assets at beginning of period 150,517 134,909  
Actual return on plan assets (11,922) 19,030  
Employer contributions 4,538 4,214  
Benefits paid (7,799) (7,063)  
Effect of settlement (331) (884)  
Defined Benefit Plan, Plan Assets, Divestiture 0 (2,262)  
Other (1,552) 2,137  
Fair value of plan assets at end of period 133,861 150,517 134,909
Funded status (56,805) (54,211)  
Amounts recognized in the consolidated balance sheets consist of:      
Current liability (1,173) (1,440)  
Noncurrent liability (55,632) (52,771)  
Net amount recognized (56,805) (54,211)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 47,501 43,651  
Prior service cost 351 371  
Net amount recognized [1] 47,852 44,022  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax 12,300 16,300  
Accumulated benefit obligation 181,642 192,192  
Net pension cost includes the following components:      
Service cost 3,064 3,043 2,549
Interest cost 6,443 6,711 6,950
Expected return on plan assets (8,226) (7,181) (7,552)
Net amortization and deferral 3,578 4,821 4,668
Curtailment (263) 0 (1,285)
Settlement 47 42 (114)
Net pension cost 4,643 7,436 5,216
Amounts recognized in accumulated other comprehensive income (loss):      
Amortization of actuarial loss 2,633 2,985 2,846
Actuarial (loss)/gain recognized (5,886) 2,763 (3,861)
Amortization of settlement (2) 27 (69)
Amortization of prior service costs 26 24 24
Amortization of curtailment 498 0  
Other 9 30 44
Pension adjustments (2,730) $ 5,829 $ (1,016)
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension cost in fiscal 2012:      
Net actuarial loss 4,586    
Prior service cost 36    
Total $ 4,622    
Weighted average assumptions used to determine benefit obligations:      
Discount rate 3.68% 3.40% 3.81%
Rate of compensation increase 0.42% 0.38% 0.38%
Weighted average assumptions used to determine net periodic benefit cost for the employee benefit pension plans:      
Discount rate 2.30% 3.49% 3.55%
Rate of increase in future compensation levels 0.36% 0.43% 0.84%
Expected long-term rate of return on assets 6.13% 6.17% 6.52%
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2019 $ 10,508    
2020 9,171    
2021 11,019    
2022 10,939    
2023 10,611    
Years 2023 – 2027 61,581    
Multiemployer Plans [Abstract]      
Contributions $ 3,547 $ 3,472 $ 3,373
Number Of Multiemployer Plans, Withdrawal Obligation | plan 2    
Multiemployer Plans, Withdrawal Obligation $ 1,600    
Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 3,375 2,783  
Fair value of plan assets at end of period 3,337 3,375 2,783
Western Conference Of Teamsters Pension Plan [Member]      
Multiemployer Plans [Abstract]      
Contributions [2] 1,505 1,524 1,456
Central States, Southeast and Southwest Areas Pension Plan [Member]      
Multiemployer Plans [Abstract]      
Contributions [3],[4] 978 968 934
Other Multiemployer Plans [Member]      
Multiemployer Plans [Abstract]      
Contributions $ 1,064 980 $ 983
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 $ 107,301    
Fair value of plan assets at end of period 95,275 107,301  
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 97,425    
Fair value of plan assets at end of period 85,639 97,425  
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 6,501    
Fair value of plan assets at end of period 6,299 6,501  
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 3,375    
Fair value of plan assets at end of period 3,337 3,375  
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 23,231    
Fair value of plan assets at end of period 21,670 23,231  
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 23,231    
Fair value of plan assets at end of period 21,670 23,231  
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 1,869    
Fair value of plan assets at end of period 2,032 1,869  
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 1,869    
Fair value of plan assets at end of period 2,032 1,869  
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 44,173    
Fair value of plan assets at end of period 37,223 44,173  
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 44,173    
Fair value of plan assets at end of period 37,223 44,173  
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 28,152    
Fair value of plan assets at end of period 24,714 28,152  
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 28,152    
Fair value of plan assets at end of period 24,714 28,152  
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 9,876    
Fair value of plan assets at end of period 9,636 9,876  
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 6,501    
Fair value of plan assets at end of period 6,299 6,501  
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 3,375    
Fair value of plan assets at end of period 3,337 3,375  
Portion at Other than Fair Value Measurement [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 43,216    
Fair value of plan assets at end of period $ 38,586 $ 43,216  
[1] Amounts do not include deferred taxes of $12.3 million and $16.3 million at December 29, 2018 and December 30, 2017, 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 March 30, 2022.
[3] In July 2005 this plan received a 10 year extension from the IRS for amortizing unfunded liabilities.
[4] 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 April 30, 2019.