Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.19.3
Basis of Presentation (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 04, 2019
Jul. 01, 2019
Feb. 13, 2019
Sep. 28, 2019
Mar. 30, 2019
Sep. 29, 2018
Mar. 31, 2018
Sep. 28, 2019
Sep. 29, 2018
Jan. 01, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                      
Acquisition of business, net of cash acquired               $ 21,785,000 $ 0    
Research and development, design and related engineering       $ 25,600,000   $ 31,200,000   80,000,000.0 $ 89,000,000.0    
Adoption of ASU 2018-02             $ 1,400,000        
Right-of-use assets       25,100,000       25,100,000      
Lease liability       25,393,000       25,393,000      
Property, plant and equipment, net       $ 113,137,000       $ 113,137,000     $ 120,862,000
Accounting Standards Update 2016-02                      
Business Acquisition [Line Items]                      
Right-of-use assets                   $ 18,400,000  
Lease liability                   18,500,000  
Accounting Standards Update 2016-02 | Reclassification                      
Business Acquisition [Line Items]                      
Property, plant and equipment, net                   $ (3,500,000)  
Freedom Communication Technologies, Inc.                      
Business Acquisition [Line Items]                      
Acquisition of business, net of cash acquired   $ 21,800,000                  
Cash acquired   $ 600,000                  
Diagnosys | Subsequent Event                      
Business Acquisition [Line Items]                      
Cash paid to acquire stock $ 7,000,000.0                    
Potential additional earn-out $ 13,000,000.0                    
Achievement period 3 years                    
Earn-out achievement benchmark $ 72,000,000.0                    
Divestiture by Sale | Test Systems Segment                      
Business Acquisition [Line Items]                      
Total cash proceeds of divesture     $ 103,800,000                
Gain on sale, net of tax         $ 80,100,000            
Income taxes from divesture         $ 21,300,000