Business Acquisitions (Narrative) (Details) - USD ($)				12 Months Ended
	Dec. 31, 2019	Aug. 05, 2019	Nov. 21, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Business Acquisition [Line Items]
Contingent consideration				$ 26,497,000	$ 0	$ 0
Revenue				828,586,000	892,518,000	$ 778,032,000
R D Acquisition
Business Acquisition [Line Items]
Consideration paid at closing	$ 58,373,000
Earn out payments, fair value	16,903,000
Revenue				47,586,000
Acquisition costs				2,356,000
Goodwill, expected tax deductible amount				0
Intangible assets	42,251,000
R D Acquisition | Maximum
Business Acquisition [Line Items]
Estimated contingent consideration	$ 26,000,000
Endevco
Business Acquisition [Line Items]
Consideration paid at closing		$ 70,000,000
Revenue				18,300,000	4,409,000
Intangible assets		25,700,000
Cash paid at closing		$ 68,330,000
E2M Technologies B.V.
Business Acquisition [Line Items]
Consideration paid at closing			$ 79,772,000
Revenue					29,554,000
Acquisition costs					$ 1,287,000
Goodwill, expected tax deductible amount				$ 0
Intangible assets			43,989,000
Cash paid at closing			$ 80,287,000