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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Fair Value Assumptions of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | $ 102,414 | $ 112,570
Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 110 | 6,128
Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 102,304 | 106,442
Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Pooled separate accounts: |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 110 | 6,128
Pooled separate accounts: | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 110 | 6,128
Pooled separate accounts: | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Pooled separate accounts: | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Pooled separate accounts |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 2,491 | 3,483
Large U.S. equity funds | Pooled separate accounts | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Pooled separate accounts | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 2,491 | 3,483
Large U.S. equity funds | Pooled separate accounts | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Common collective trusts funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 17,351 | 22,695
Large U.S. equity funds | Common collective trusts funds | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Large U.S. equity funds | Common collective trusts funds | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 17,351 | 22,695
Large U.S. equity funds | Common collective trusts funds | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds | Pooled separate accounts |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 292 | 420
Small/Mid U.S. equity funds | Pooled separate accounts | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds | Pooled separate accounts | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 292 | 420
Small/Mid U.S. equity funds | Pooled separate accounts | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds | Common collective trusts funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,880 | 20,592
Small/Mid U.S. equity funds | Common collective trusts funds | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Small/Mid U.S. equity funds | Common collective trusts funds | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,880 | 20,592
Small/Mid U.S. equity funds | Common collective trusts funds | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Pooled separate accounts |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 1,489 | 1,665
International equity funds | Pooled separate accounts | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Pooled separate accounts | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 1,489 | 1,665
International equity funds | Pooled separate accounts | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Common collective trusts funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 22,516 | 19,923
International equity funds | Common collective trusts funds | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
International equity funds | Common collective trusts funds | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 22,516 | 19,923
International equity funds | Common collective trusts funds | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Pooled separate accounts |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 4,763 | 4,799
Fixed income funds | Pooled separate accounts | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Pooled separate accounts | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 4,763 | 4,799
Fixed income funds | Pooled separate accounts | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Common collective trusts funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 42,217 | 32,865
Fixed income funds | Common collective trusts funds | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Fixed income funds | Common collective trusts funds | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 42,217 | 32,865
Fixed income funds | Common collective trusts funds | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Real estate | Common collective trusts funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,305 | 0
Real estate | Common collective trusts funds | Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 0 | 0
Real estate | Common collective trusts funds | Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | 5,305 | 0
Real estate | Common collective trusts funds | Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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