PENSION AND OTHER POSTRETIREMENT BENEFITS - Assumptions Used to Determine Projected Benefits and Periodic Costs (Details)	6 Months Ended	12 Months Ended
	Jan. 03, 2020	Jan. 01, 2021	Jun. 28, 2019	Jun. 29, 2018
Pension
Obligation assumptions as of:
Discount rate	3.14%	2.31%
Rate of future compensation increase	2.80%	3.01%
Cash balance interest crediting rate	3.50%	3.50%
Cost assumptions for fiscal periods ended:
Discount rate to determine service cost	3.11%	2.87%	3.89%	3.48%
Discount rate to determine interest cost	2.94%	2.74%	3.75%	3.28%
Expected return on plan assets	7.68%	7.68%	7.66%	7.66%
Rate of future compensation increase	2.97%	2.80%	2.76%	2.76%
Cash balance interest crediting rate	3.50%	3.50%	3.50%	3.50%
Other Benefits
Obligation assumptions as of:
Discount rate	2.97%	2.10%
Cost assumptions for fiscal periods ended:
Discount rate to determine service cost	3.47%	3.25%	4.14%	3.62%
Discount rate to determine interest cost	2.74%	2.55%	3.62%	3.04%