ASSOCIATE BENEFIT PLANS - Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 01, 2019	Mar. 31, 2019	Mar. 31, 2018
Postretirement Health Coverage
Business Acquisition [Line Items]
Service cost		$ 13	$ 15
Interest cost		19	17
Prior service cost amortization		(19)	(19)
Net gain recognition		(15)	(11)
Net periodic benefit cost		(2)	2
Pension Plan
Business Acquisition [Line Items]
Service cost	$ 0
Interest cost	286
Expected return on plan assets	(481)
Prior service cost amortization	0
Net gain recognition	0
Net periodic benefit cost	(195)
Pension Plan | Alliance
Business Acquisition [Line Items]
Service cost		10	10
Interest cost		69	73
Expected return on plan assets		(147)	(135)
Prior service cost amortization		0	0
Net gain recognition		0	0
Net periodic benefit cost		$ (68)	$ (52)
Other Postretirement Benefits
Business Acquisition [Line Items]
Service cost	8
Interest cost	59
Expected return on plan assets	0
Prior service cost amortization	0
Net gain recognition	0
Net periodic benefit cost	$ 67