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Segment Reporting Information - Operations and Assets (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2021 USD ($)	Sep. 25, 2020 USD ($)	Sep. 24, 2021 USD ($) segment	Sep. 25, 2020 USD ($)	Dec. 25, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Revenues	$ 486,696	$ 439,316	$ 1,447,989	$ 1,179,775
Operating Earnings	124,599	125,005	386,728	259,590
Total Assets	2,377,328		2,377,328		$ 1,988,128
Operating Segments | Industrial
Segment Reporting Information [Line Items]
Revenues	211,030	172,805	600,339	464,776
Operating Earnings	73,294	60,776	207,905	148,010
Total Assets	694,616		694,616		632,165
Operating Segments | Process
Segment Reporting Information [Line Items]
Revenues	96,184	78,773	284,790	242,610
Operating Earnings	21,514	16,187	64,923	45,970
Total Assets	427,020		427,020		404,370
Operating Segments | Contractor
Segment Reporting Information [Line Items]
Revenues	179,482	187,738	562,860	472,389
Operating Earnings	36,177	54,841	134,340	124,580
Total Assets	484,933		484,933		438,067
Unallocated corporate
Segment Reporting Information [Line Items]
Operating Earnings	(6,386)	(6,532)	(20,440)	(23,741)
Impairment - Segment Information	0	$ (267)	0	$ (35,229)
Total Assets	$ 770,759		$ 770,759		$ 513,526

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