FAIR VALUE - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 55,278	$ 45,982
Other assets:
Life insurance policies	30,454	24,541
Total assets measured at fair value	85,732	70,523
Other current liabilities measured at fair value:
Contingent consideration	712	3,033
Foreign currency forward contract	876	1,319
Total liabilities measured at fair value	1,588	4,352
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	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	55,278	45,982
Other assets:
Life insurance policies	30,454	24,541
Total assets measured at fair value	85,732	70,523
Other current liabilities measured at fair value:
Contingent consideration	0	0
Foreign currency forward contract	876	1,319
Total liabilities measured at fair value	876	1,319
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	712	3,033
Foreign currency forward contract	0	0
Total liabilities measured at fair value	$ 712	$ 3,033