RESTRUCTURING AND ASSET IMPAIRMENTS - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 13,839	$ 7,568	$ 4,778
Severance and retention costs liability	6,406	2,921	6,856	$ 8,102
Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,385	48	929
Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	11,454	7,520	3,849
Severance and Transition Costs | Accrued Compensation
Restructuring Cost and Reserve [Line Items]
Severance and retention costs liability	6,300	2,400
Severance and Transition Costs | Other Long-Term Liabilities
Restructuring Cost and Reserve [Line Items]
Severance and retention costs liability	100	500
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Restructuring costs	6,715	950	2,873
Cost of revenue | Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,367	27	929
Cost of revenue | Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 4,348	923	1,944
2017 RMS Restructuring | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1,983	18,145
2017 RMS Restructuring | Asset Impairments and Other Costs | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs		822	17,716
2017 RMS Restructuring | Severance and Transition Costs | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1,161	429
2017 RMS Restructuring | Cost of revenue | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1,669	18,078
2017 RMS Restructuring | Cost of revenue | Asset Impairments and Other Costs | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs		822	17,716
2017 RMS Restructuring | Cost of revenue | Severance and Transition Costs | RMS
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 847	$ 362