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Segment Reporting Information - Operations and Assets (Details) $ in Thousands	3 Months Ended
	Mar. 26, 2021 USD ($) segment	Mar. 27, 2020 USD ($)	Dec. 25, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Revenues	$ 454,129	$ 373,567
Operating Earnings	128,286	89,812
Total Assets	2,087,720		$ 1,988,128
Operating Segments | Industrial
Segment Reporting Information [Line Items]
Revenues	184,732	158,684
Operating Earnings	65,243	50,233
Total Assets	626,256		632,165
Operating Segments | Process
Segment Reporting Information [Line Items]
Revenues	91,373	86,078
Operating Earnings	21,733	18,111
Total Assets	411,804		404,370
Operating Segments | Contractor
Segment Reporting Information [Line Items]
Revenues	178,024	128,805
Operating Earnings	48,166	28,630
Total Assets	459,715		438,067
Unallocated corporate
Segment Reporting Information [Line Items]
Operating Earnings	(6,856)	$ (7,162)
Total Assets	$ 589,945		$ 513,526

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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