SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Rollforward of Uncollectible Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance, prior period	$ 13,313	$ 9,962
Cumulative effect of accounting change	13,313	11,821
Provision for expected credit losses	676	725
Amounts charged against allowance for credit losses, net of recoveries	438
Amounts charged against allowance for credit losses, net of recoveries		(354)
Allowance for credit losses of acquired company at date of acquisition	0	810
Ending balance	14,427	11,821
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance, prior period	0	678
Cumulative effect of accounting change	$ 0	$ 678