PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Unrecognized Benefit Amounts) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Pension Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net actuarial loss (gain), beginning of year	$ 54,343	$ 54,235	$ 46,494
Amortization	(1,313)	(1,203)	(932)
Settlement adjustments	(3,538)	0	0
Actuarial loss (gain)	20,729	(15,635)	15,745
Asset loss (gain)	(11,982)	16,946	(7,072)
Net actuarial loss (gain), end of year	58,239	54,343	54,235
Other Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net actuarial loss (gain), beginning of year	(34)	35	(31)
Amortization	0	0	0
Settlement adjustments	(7)	3	(2)
Actuarial loss (gain)	132	(72)	68
Asset loss (gain)	0	0	0
Net actuarial loss (gain), end of year	$ 91	$ (34)	$ 35

Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, after tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan.

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