Segment Reporting Information - Operations and Assets (Details) $ in Thousands	3 Months Ended
	Mar. 27, 2020 USD ($) segment	Mar. 29, 2019 USD ($)	Dec. 27, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Revenues	$ 373,567	$ 404,870
Operating Earnings	89,812	104,527
Total Assets	1,947,340		$ 1,692,210
Operating Segments | Industrial
Segment Reporting Information [Line Items]
Revenues	158,684	189,100
Operating Earnings	50,233	65,203
Total Assets	616,333		615,486
Operating Segments | Process
Segment Reporting Information [Line Items]
Revenues	86,078	86,894
Operating Earnings	18,111	20,014
Total Assets	383,876		387,216
Operating Segments | Contractor
Segment Reporting Information [Line Items]
Revenues	128,805	128,876
Operating Earnings	28,630	26,539
Total Assets	396,721		368,832
Unallocated corporate
Segment Reporting Information [Line Items]
Operating Earnings	(7,162)	$ (7,229)
Total Assets	$ 550,410		$ 320,676