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Summary of Significant Accounting Policies (Goodwill by Reporting Segment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 25, 2020
Segment Reporting Information
Write-downs of long-lived assets	$ 0
Goodwill Roll Forward
Beginning balance	347,603,000	$ 307,663,000
Additions, adjustments from business acquisitions	13,321,000	29,657,000
Foreign currency translation	(4,669,000)	10,283,000
Ending balance	356,255,000	347,603,000
Industrial
Goodwill Roll Forward
Beginning balance	186,536,000	177,112,000
Additions, adjustments from business acquisitions	13,321,000	0
Foreign currency translation	(4,460,000)	9,424,000
Ending balance	195,397,000	186,536,000
Process
Goodwill Roll Forward
Beginning balance	141,513,000	110,997,000
Additions, adjustments from business acquisitions	0	29,657,000
Foreign currency translation	(209,000)	859,000
Ending balance	141,304,000	141,513,000
Contractor
Goodwill Roll Forward
Beginning balance	19,554,000	19,554,000
Additions, adjustments from business acquisitions	0	0
Foreign currency translation	0	0
Ending balance	$ 19,554,000	$ 19,554,000

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