FAIR VALUE - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 186,599	$ 55,278
Other assets:
Life insurance policies	23,834	30,454
Total assets measured at fair value	210,433	85,732
Other current liabilities measured at fair value:
Contingent consideration	2,563	712
Foreign currency forward contract		876
Total liabilities measured at fair value	2,563	1,588
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Other assets:
Life insurance policies	0	0
Total assets measured at fair value	0	0
Other current liabilities measured at fair value:
Contingent consideration	0	0
Foreign currency forward contract		0
Total liabilities measured at fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	186,599	55,278
Other assets:
Life insurance policies	23,834	30,454
Total assets measured at fair value	210,433	85,732
Other current liabilities measured at fair value:
Contingent consideration	0	0
Foreign currency forward contract		876
Total liabilities measured at fair value	0	876
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Other assets:
Life insurance policies	0	0
Total assets measured at fair value	0	0
Other current liabilities measured at fair value:
Contingent consideration	2,563	712
Foreign currency forward contract		0
Total liabilities measured at fair value	$ 2,563	$ 712