RESTRUCTURING AND ASSET IMPAIRMENTS - Severance and Retention Costs For RMS Facility by Classification on the Consolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 13,839	$ 7,568	$ 4,778
Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	6,715	950	2,873
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	7,124	6,618	1,905
Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	11,454	7,520	3,849
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	4,348	923	1,944
Severance and Transition Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	7,106	6,597	1,905
Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,385	48	929
Asset Impairments and Other Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,367	27	929
Asset Impairments and Other Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 18	21	0
2017 RMS Restructuring | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1,983	18,145
2017 RMS Restructuring | RMS | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1,669	18,078
2017 RMS Restructuring | RMS | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs		314	67
2017 RMS Restructuring | RMS | Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1,161	429
2017 RMS Restructuring | RMS | Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Restructuring costs		847	362
2017 RMS Restructuring | RMS | Severance and Transition Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs		314	67
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs		822	17,716
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Restructuring costs		822	17,716
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 0	$ 0