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Employee Benefit Plans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
plan
Jan. 02, 2016
USD ($)
Jan. 03, 2015
USD ($)
Fair Value Measurement [Domain]      
Change in plan assets:      
Fair value of plan assets at beginning of period $ 127,970    
Fair value of plan assets at end of period 134,909 $ 127,970  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 78,474    
Fair value of plan assets at end of period 85,936 78,474  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 5,801    
Fair value of plan assets at end of period 7,887 5,801  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 2,320    
Fair value of plan assets at end of period 2,783 2,320  
Projected benefit obligation at beginning of period 182,276 395,142  
Acquisitions 0 0  
Service cost 2,549 6,638 $ 5,208
Interest cost 6,950 10,536 13,214
Employee contributions 439 1,862  
Plan amendments 101 90  
Actuarial loss/(gain) 7,905 (24,436)  
Benefits paid (7,146) (11,197)  
Effect of curtailment (1,286) (9,545)  
Effect of settlement (953) (162,600)  
Other (1,545) (24,214)  
Projected benefit obligation at end of period 189,290 182,276 395,142
Fair value of plan assets at beginning of period 127,970 328,220  
Acquisitions 0 0  
Actual return on plan assets 10,138 (17,888)  
Employer contributions 5,250 9,612  
Benefits paid (7,146) (11,197)  
Effect of settlement (953) (162,600)  
Other (789) (20,039)  
Fair value of plan assets at end of period 134,909 127,970 328,220
Funded status (54,381) (54,306)  
Amounts recognized in the consolidated balance sheets consist of:      
Noncurrent assets 0 0  
Current liability (1,229) (1,086)  
Noncurrent liability (53,152) (53,220)  
Net amount recognized (54,381) (54,306)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 52,525 51,921  
Prior service cost/(credit) 417 359  
Net amount recognized [1] 52,942 52,280  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax 19,400 19,700  
Accumulated benefit obligation 181,340 171,530  
Net pension cost includes the following components:      
Service cost 2,549 6,638 5,208
Interest cost 6,950 10,536 13,214
Expected return on plan assets (7,552) (12,229) (14,439)
Net amortization and deferral 4,668 5,034 2,094
Curtailment (1,285) (1,181) 7
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements (114) (2,353) 0
Net pension cost 5,216 6,445 6,084
Amounts recognized in accumulated other comprehensive income (loss):      
Amortization of actuarial loss 2,846 3,115 1,272
Actuarial (loss)/gain recognized (3,861) (2,323) (22,546)
Amortization of settlement (69) 3,823  
Amortization of prior service costs 24 (31) 14
Actuarial prior service cost recognized 0 0 879
Amortization of curtailment 0 (853)  
Other 44 471  
Pension adjustments (1,016) $ 4,202 $ (20,381)
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension cost in fiscal 2012:      
Net actuarial loss 4,754    
Prior service cost 33    
Total $ 4,787    
Weighted average assumptions used to determine benefit obligations:      
Discount rate 3.81% 4.13% 2.79%
Rate of compensation increase 0.38% 0.31% 1.82%
Weighted average assumptions used to determine net periodic benefit cost for the employee benefit pension plans:      
Discount rate 3.55% 3.47% 4.15%
Rate of increase in future compensation levels 0.84% 0.38% 1.70%
Expected long-term rate of return on assets 6.52% 6.62% 5.06%
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]      
2017 $ 9,854    
2018 8,438    
2019 9,307    
2020 9,849    
2021 10,931    
Years 2022 – 2026 58,887    
Multiemployer Plans [Abstract]      
Contributions $ 3,373 $ 3,231 $ 3,302
Number Of Multiemployer Plans, Withdrawal Obligation | plan 2    
Multiemployer Plans, Withdrawal Obligation $ 1,800    
Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 2,320 194,909  
Fair value of plan assets at end of period 2,783 2,320 194,909
Western Conference Of Teamsters Pension Plan [Member]      
Multiemployer Plans [Abstract]      
Contributions [2] 1,456 1,387 1,384
Central States, Southeast and Southwest Areas Pension Plan [Member]      
Multiemployer Plans [Abstract]      
Contributions [3],[4] 934 858 876
Other Multiemployer Plans [Member]      
Multiemployer Plans [Abstract]      
Contributions $ 983 986 $ 1,042
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 $ 86,595    
Fair value of plan assets at end of period 96,606 86,595  
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 78,474    
Fair value of plan assets at end of period 85,936 78,474  
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 5,801    
Fair value of plan assets at end of period 7,887 5,801  
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 2,320    
Fair value of plan assets at end of period 2,783 2,320  
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 21,079    
Fair value of plan assets at end of period 17,408 21,079  
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 21,079    
Fair value of plan assets at end of period 17,408 21,079  
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 1,341    
Fair value of plan assets at end of period 2,825 1,341  
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 1,341    
Fair value of plan assets at end of period 2,825 1,341  
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 34,864    
Fair value of plan assets at end of period 41,300 34,864  
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 34,864    
Fair value of plan assets at end of period 41,300 34,864  
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 21,190    
Fair value of plan assets at end of period 24,403 21,190  
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 21,190    
Fair value of plan assets at end of period 24,403 21,190  
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 8,121    
Fair value of plan assets at end of period 10,670 8,121  
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 5,801    
Fair value of plan assets at end of period 7,887 5,801  
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 2,320    
Fair value of plan assets at end of period 2,783 2,320  
Portion at Other than Fair Value Measurement [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of period 41,375    
Fair value of plan assets at end of period $ 38,303 $ 41,375  
[1] Amounts do not include deferred taxes of $19.4 million and $19.7 million at December 31, 2016 and January 2, 2016, 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. Certain of these agreements have expired and are being renegotiated with others having expiration dates through April 1, 2020.
[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 August 6, 2018.