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Nature of Operations and Summary of Significant Accounting Policies - Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2020 USD ($)
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	$ 421,541
Accumulated impairment losses	(85,509)
Net Balance, Beginning Balance	336,032
Acquisition (Note 2)	3,985
Currency translation	2,982
Total 2020 adjustments	6,967
Gross Balance, Ending Balance	428,508
Accumulated impairment losses	(85,509)
Net Balance, Ending Balance	342,999
Operating Segment | Flow Control
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	97,680
Accumulated impairment losses	0
Net Balance, Beginning Balance	97,680
Acquisition (Note 2)	0
Currency translation	804
Total 2020 adjustments	804
Gross Balance, Ending Balance	98,484
Accumulated impairment losses	0
Net Balance, Ending Balance	98,484
Operating Segment | Industrial Processing
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	207,536
Accumulated impairment losses	(85,509)
Net Balance, Beginning Balance	122,027
Acquisition (Note 2)	3,985
Currency translation	493
Total 2020 adjustments	4,478
Gross Balance, Ending Balance	212,014
Accumulated impairment losses	(85,509)
Net Balance, Ending Balance	126,505
Operating Segment | Material Handling Systems
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	116,325
Accumulated impairment losses	0
Net Balance, Beginning Balance	116,325
Acquisition (Note 2)	0
Currency translation	1,685
Total 2020 adjustments	1,685
Gross Balance, Ending Balance	118,010
Accumulated impairment losses	0
Net Balance, Ending Balance	$ 118,010

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