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Employee Benefits - Single-Employer Defined Benefit Pension Plan - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
USD ($)
payment
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Retirement Benefits [Abstract]      
Unfunded status $ 26,668 $ 30,360  
Gain (loss) adjustment to other comprehensive income (loss) net of tax (600) 100 $ (2,100)
Decrease in the unfunded obligation 3,700    
Actuarial (gain) loss (9,732) 5,808  
Actual (loss) return on plan assets 6,321 (11,109)  
Employer contributions 4,668 3,674  
Charge due to current year service and interest cost 4,400    
Net periodic pension costs (162) 186 $ (799)
Estimated net loss expected to be amortized from accumulated other comprehensive loss into net periodic cost over the next fiscal year 1,000    
Accumulated benefit obligation for the hourly pension plan $ 107,400 $ 118,200  
Expected return on plan assets assumption (percent) 6.00% 8.10%  
Number of minimum quarterly cash contributions during fiscal 2016 and 2017 | payment 4    
Minimum required contribution for plan year, per quarter cash contributions during fiscal - 2016 $ 2,200