COMMITMENTS AND CONTINGENCIES - Obligations by year (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Dec. 30, 2018
Purchase obligations
2020	$ 33,237
2021	9,482
2022	3,751
2023	2,565
2024	3
Thereafter	4
Total	49,042
Lease obligations
2020	12,879
2021	10,776
2022	10,947
2023	10,350
2024	9,004
Thereafter	21,858
Total undiscounted cash flows	75,814
Sublease income
2020	(3,493)
2021	(1,498)
2022	(389)
2023	(211)
2024	(59)
Thereafter	(10)
Total	(5,660)
Net lease obligation
2020	9,386
2021	9,278
2022	10,558
2023	10,139
2024	8,945
Thereafter	21,848
Total	70,154
Total
2020	44,617
2021	20,131
2022	15,348
2023	13,530
2024	9,613
Thereafter	27,637
Total	130,876
Self-Insurance
Workers' compensation obligations
2020	1,994
2021	1,371
2022	1,039
2023	826
2024	665
Thereafter	5,785
Total	$ 11,680	$ 12,300