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Restructuring Costs - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 26, 2020 USD ($) Employee	Sep. 28, 2019 USD ($)	Sep. 26, 2020 USD ($) Employee	Sep. 28, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 470,000	$ 0	$ 926,000	$ 0
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 470,000		$ 926,000
Flow Control
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated related to restructuring (employee) | Employee	4		34
Flow Control | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 276,000		$ 732,000
Industrial Processing
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated related to restructuring (employee) | Employee	20		20
Severance costs			$ 0
Industrial Processing | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 194,000		$ 194,000
Number of positions eliminated related to restructuring (employee) | Employee			21

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