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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) plan | Dec. 25, 2016 USD ($) | Dec. 27, 2015 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Retirement plan expenses | $ 10,800,000 | $ 11,200,000 | $ 11,200,000
Accumulated benefit obligation, defined benefit pension plans | $ 178,200,000 | 167,200,000 |
Weighted average duration of defined benefit obligation | 31 years 7 days |  |
Actuarial loss expected to be recognized in net pension cost throughout 2015 | $ 1,200,000 |  |
Expenses related to defined contribution plans | $ 9,500,000 | $ 8,100,000 | $ 5,500,000
Fixed income securities | Pooled separate accounts |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 50.00% |  |
Fixed income securities | Common collective trusts funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 30.00% |  |
Equity securities | Pooled separate accounts |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 50.00% |  |
Equity securities | Common collective trusts funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Target plan asset allocations | 70.00% |  |
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Expected contributions during 2015 | $ 12,200,000 |  |
Pension Benefits | Qualified Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined benefit plans, number of plans | plan | 2 |  |
Pension Benefits | Nonqualified Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined benefit plans, number of plans | plan | 2 |  |
Postretirement Life Insurance Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined benefit plans, number of plans | plan | 1 |  |
Other Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Impact of 0.25% change in discount rate on projected benefit obligation | $ 1,000 |  |
Expected contributions during 2015 | $ 100,000 |  |
Other Plans | Domestic Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined contribution plans, number of plans | plan | 2 |  |
Maximum annual contribution per employee, percent | 30.00% |  |
Maximum annual contribution per employee, amount | $ 245,000 |  |
Other Plans | Domestic Plan | Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Matching contribution, percent of employees' salary | 2.00% |  |
Other Plans | Domestic Plan | Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Matching contribution, percent of employees' salary | 6.00% |  |
Other Plans | Mexico |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined contribution plans, number of plans | plan | 3 |  |
Other Plans | U.K. and Europe |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Defined contribution plans, number of plans | plan | 2 |  |
Salaried Employee | Other Plans | U.K. and Europe |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Maximum annual contribution per employee, percent | 3.00% |  |
Salaried Employee | Other Plans | U.K. and Europe | Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Matching contribution, percent of employees' salary | 4.00% |  |
Salaried Employee | Other Plans | U.K. and Europe | Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Matching contribution, percent of employees' salary | 5.50% |  |
Weekly Employee | Other Plans | U.K. and Europe |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Maximum annual contribution per employee, percent | 1.00% |  |
Matching contribution, percent of employees' salary | 1.00% |  |

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