Reportable Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Revenues	$ 610,371	$ 508,683
Depreciation expense	(11,200)	(10,700)
Amortization of intangibles	(8,817)	(7,993)
Severance, restructuring, and acquisition integration costs	(2,983)	(1,768)
Asset impairments	0	(6,995)
Operating income	73,521	50,948
Interest expense, net	(14,411)	(15,511)
Loss on debt extinguishment	(6,392)	0
Total non-operating pension benefit	1,200	684
Consolidated income from continuing operations before taxes	53,918	36,121
Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Revenues	610,371	508,683
Total Segment EBITDA	98,349	75,902
Depreciation expense	(11,226)	(10,727)
Amortization of intangibles	(8,817)	(7,993)
Amortization of software development intangible assets	(1,007)	(409)
Severance, restructuring, and acquisition integration costs	(3,723)	(5,171)
Asset impairments	0	(6,995)
Purchase accounting effects related to acquisitions	0	6,374
Impairment of assets held-for-use		3,600
Impairment of assets to be held for sale		3,400
Business combination, increase (decrease) in earn-out liability		5,800
Collection of receivables, previously written off		1,400
Reportable Segment | OTN Systems N.V.
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting effects related to acquisitions		800
Intersegment Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Eliminations	$ (55)	$ (33)