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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