COMMITMENTS AND CONTINGENCIES - Legal Proceedings (Details) $ in Millions	1 Months Ended		3 Months Ended
	Feb. 28, 2009 item	Dec. 31, 2008 item	Mar. 29, 2020 USD ($) subsidiary item
Contingencies
Number of subsidiaries | subsidiary			53
"Sacramento Case"
Contingencies
Number of carriers	5,000
Number of phases			3
"Fresno Case"
Contingencies
Number of carriers		3,500
Number of phases			2
ABL Credit Agreement | Letter of credit
Contingencies
Outstanding letters of credit | $			$ 26.7