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Post-Retirement Health Care (Schedule of Cost of Retirement Plans) (Details) - Postretirement Health Coverage - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Dec. 30, 2017 | Dec. 31, 2016
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year | $ 21,153 | $ 20,884 |  |
Service cost | 741 | 735 |  |
Interest cost | 825 | 846 |  |
Benefits paid | (1,003) | (1,017) |  |
Actuarial (gain) loss | 1,217 | (295) |  |
Benefit obligation at end of year | 22,933 | 21,153 |  |
Change in plan assets |  |  |  |
Fair value at beginning of year | 0 | 0 |  |
Actual return on assets | 0 | 0 |  |
Employer contribution | 1,003 | 1,017 |  |
Transferred out | 0 | 0 |  |
Benefits paid | (1,003) | (1,017) |  |
Fair value at end of year | 0 | 0 |  |
Funded Status of Plan |  |  | $ (22,933) | $ (21,153)
Amounts recognized in the Statement of Financial Position consist of: |  |  |  |
Current liabilities |  |  | 1,050 | 1,034
Non-current liabilities |  |  | 21,883 | 20,119
Amounts recognized in Accumulated Other Comprehensive Income (before tax) consist of: |  |  |  |
Actuarial (gain) loss |  |  | 3,565 | 2,373
Total Amount recognized in Accumulated Other Comprehensive Income (before tax) | 2,373 | 2,730 | $ 3,565 | $ 2,373
Change in Accumulated Other Comprehensive Income (before tax): |  |  |  |
Amount disclosed at beginning of year | 2,373 | 2,730 |  |
Actuarial (gain) loss | 1,217 | (295) |  |
Amortization of transition amount | (25) | (62) |  |
Amount disclosed at end of year | $ 3,565 | $ 2,373 |  |

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