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Employee Benefits - Single-Employer Defined Benefit Pension Plan - Narrative (Details) $ in Thousands | 12 Months Ended
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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 |  |

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