Business Acquisitions (Fair Values Assigned to the Assets and Liabilities Assumed) (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Aug. 05, 2019	Nov. 21, 2018	Dec. 28, 2019	Dec. 29, 2018	Sep. 28, 2019
Asset (Liability)
Goodwill			$ 429,838		$ 429,039
Supplemental information
Total estimated purchase price, net of cash acquired			$ 0	$ 78,032
Finite-Lived Intangible Asset Lives (Years)			14 years 3 months 18 days		14 years 4 months 24 days
E2M Technologies B.V.
Asset (Liability)
Accounts receivable		$ 4,651
Unbilled accounts receivable		1,518
Inventories		11,063
Prepaid expenses and other current assets		123
Property and equipment		672
Intangible assets		43,989
Other long-term assets		60
Goodwill		36,665
Accounts payable		(3,657)
Accrued payroll and related costs		(1,328)
Advance payments from customers		(4,315)
Accrued income taxes		(290)
Other accrued liabilities		(127)
Deferred income taxes		(10,477)
Net assets acquired		78,547
Supplemental information
Consideration paid at closing		79,772
Post-closing purchase price adjustment		515
Less: Cash acquired		(1,740)
Total estimated purchase price, net of cash acquired		78,547
Endevco
Asset (Liability)
Inventories	$ 11,649
Property and equipment	1,078
Intangible assets	25,800
Goodwill	23,246
Deferred income taxes	6,557
Net assets acquired	68,330
Supplemental information
Consideration paid at closing	70,000
Post-closing purchase price adjustment	(1,670)
Total estimated purchase price, net of cash acquired	68,330
Customer lists
Supplemental information
Finite-Lived Intangible Asset Lives (Years)			15 years 7 months 6 days		15 years 7 months 6 days
Customer lists | E2M Technologies B.V.
Asset (Liability)
Intangible assets		$ 21,652
Supplemental information
Finite-Lived Intangible Asset Lives (Years)		15 years
Customer lists | Endevco
Asset (Liability)
Intangible assets	$ 13,500
Supplemental information
Finite-Lived Intangible Asset Lives (Years)	15 years
Trademarks and trade names
Supplemental information
Finite-Lived Intangible Asset Lives (Years)			18 years 4 months 24 days		18 years 4 months 24 days
Trademarks and trade names | E2M Technologies B.V.
Asset (Liability)
Intangible assets		$ 5,926
Supplemental information
Finite-Lived Intangible Asset Lives (Years)		15 years
Trademarks and trade names | Endevco
Asset (Liability)
Intangible assets	$ 7,900
Supplemental information
Finite-Lived Intangible Asset Lives (Years)	15 years
Technology | E2M Technologies B.V.
Asset (Liability)
Intangible assets		$ 12,650
Supplemental information
Finite-Lived Intangible Asset Lives (Years)		15 years
Technology | Endevco
Asset (Liability)
Intangible assets	$ 4,400
Supplemental information
Finite-Lived Intangible Asset Lives (Years)	15 years
Other Intangible Assets
Supplemental information
Finite-Lived Intangible Asset Lives (Years)			4 years		4 years
Other Intangible Assets | E2M Technologies B.V.
Asset (Liability)
Intangible assets		$ 3,761
Supplemental information
Finite-Lived Intangible Asset Lives (Years)		4 years