Business Acquisitions (Narrative) (Details) - USD ($)				3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2019	Aug. 05, 2019	Nov. 21, 2018	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019	Sep. 28, 2019
Business Acquisition [Line Items]
Revenue				$ 211,463,000	$ 233,046,000	$ 417,306,000	$ 436,227,000
R&D Acquisition
Business Acquisition [Line Items]
Consideration paid at closing	$ 58,280,000
Estimated contingent consideration	17,447,000
Revenue				14,708,000		14,708,000
Acquisition costs						1,340,000
Intangible assets	42,094,000
Goodwill, expected tax deductible amount				0		0
E2M Technologies B.V.
Business Acquisition [Line Items]
Consideration paid at closing			$ 79,772,000
Revenue								$ 29,554,000
Acquisition costs								$ 1,287,000
Intangible assets			43,989,000
Cash paid at closing			$ 80,287,000
Goodwill, expected tax deductible amount				0		0
Endevco
Business Acquisition [Line Items]
Consideration paid at closing		$ 70,000,000
Revenue				$ 4,200,000		$ 7,500,000
Intangible assets		25,700,000
Cash paid at closing		$ 68,330,000
Maximum | R&D Acquisition
Business Acquisition [Line Items]
Business Combination, Earn-Out Payments	$ 26,000,000