Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.20.1
Basis of Presentation (Details)
 3 Months Ended
Oct. 04, 2019
USD ($)
Jul. 01, 2019
USD ($)
Feb. 13, 2019
USD ($)
Mar. 28, 2020
USD ($)
reporting_unit
Mar. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]            
Allowance for doubtful accounts       $ 3,700,000   $ 3,600,000
Research and development, design and related engineering       $ 26,200,000 $ 26,700,000  
Number of reporting units impaired | reporting_unit       4    
Impairment Loss       $ 73,704,000    
Right-of-Use Asset Impairment       691,000 0  
Operating right-of-use asset       22,018,000   23,602,000
Lease liability       24,679,000   25,556,000
Property, plant and equipment, net       111,522,000   112,499,000
Financing lease, liability       4,276,000   $ 4,737,000
Freedom Communication Technologies, Inc.            
Business Acquisition [Line Items]            
Acquisition of business, net of cash acquired   $ 21,800,000        
Cash acquired   $ 600,000        
Diagnosys            
Business Acquisition [Line Items]            
Cash paid to acquire stock $ 7,000,000.0          
Fair value of contingent purchase consideration 2,500,000          
Potential additional earn-out $ 13,000,000.0          
Achievement period 3 years          
Earn-out achievement benchmark $ 72,000,000.0          
Aerospace Segment            
Business Acquisition [Line Items]            
Impairment Loss       $ 73,700,000    
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         $ 19,700,000