Segment Information - Reconciliation of Net Income to EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Dec. 31, 2018
Segment Reporting, Other Significant Reconciling Item, Consolidated
Net income (loss)	$ (230)	$ 15,777
Income tax expense	1,197	10,349	$ (10,058)
Depreciation and amortization	33,446	30,898
Interest expense, net	16,604	17,656
Impairment and restructuring charges	6,695	4,103
(Gain) loss on sale of property and equipment	(2,073)	512
Stock-based compensation	3,733	2,596
Non-cash foreign exchange transaction/translation (income) loss	(1,189)	(3,686)
Other items	16,325	10,408
Other non-cash items	0	(665)
Adjusted EBITDA	74,508	89,278
Legal fees	11,706	1,648
Consolidation and reorganization cost	3,110	4,827
One-time lease termination charges	1,235
Acquisition-related costs		2,934
Cost of sales
Segment Reporting, Other Significant Reconciling Item, Consolidated
Impairment and restructuring charges	$ 150	$ 384