Business Acquisitions (Fair Values Assigned To The Assets And Liabilities Assumed) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Nov. 21, 2018	Dec. 29, 2018	Dec. 30, 2017	Sep. 29, 2018
Asset (Liability)
Weighted Average Useful Life (in Years)		14 years 7 months		14 years 10 months
Goodwill		$ 402,152		$ 369,275
Total estimated purchase price, net of cash acquired		$ 78,032	$ 0
E2M Technologies B.V.
Asset (Liability)
Accounts receivable	$ 5,435
Unbilled accounts receivable	749
Inventories	12,382
Prepaid expenses and other current assets	123
Property and equipment	672
Intangible assets	43,362
Other long-term assets	60
Goodwill	32,791
Accounts payable	(3,999)
Accrued payroll and related costs	(1,330)
Advance payments from customers	(5,561)
Accrued income taxes	(290)
Other accrued liabilities	(131)
Deferred income taxes	(6,231)
Net assets acquired	78,032
Cash paid at closing	79,772
Less: Cash acquired	(1,740)
Total estimated purchase price, net of cash acquired	78,032
Customer lists
Asset (Liability)
Weighted Average Useful Life (in Years)		15 years 8 months		15 years 9 months 18 days
Customer lists | E2M Technologies B.V.
Asset (Liability)
Intangible assets	21,595
Weighted Average Useful Life (in Years)		15 years
Trademarks and trade names
Asset (Liability)
Weighted Average Useful Life (in Years)		20 years 5 months 15 days		25 years 5 months
Trademarks and trade names | E2M Technologies B.V.
Asset (Liability)
Intangible assets	5,926
Weighted Average Useful Life (in Years)		15 years
Technology | E2M Technologies B.V.
Asset (Liability)
Intangible assets	12,650
Weighted Average Useful Life (in Years)		15 years
Land-use rights
Asset (Liability)
Weighted Average Useful Life (in Years)		26 years		26 years
Other Intangible Assets
Asset (Liability)
Weighted Average Useful Life (in Years)		4 years
Other Intangible Assets | E2M Technologies B.V.
Asset (Liability)
Intangible assets	$ 3,191
Weighted Average Useful Life (in Years)		4 years