REVENUE RECOGNITION - Contract Balances (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2021 USD ($)
Movement in Contract with Customer, Liability [Roll Forward]
Balance as of beginning of period	$ 65,918
Revenue recognized	(57,494)
Cash received, excluding amounts recognized as revenue during the period	12,140
Balance as of end of period	$ 20,564