Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Details)

v3.20.2
Fair Value - Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Details)
3 Months Ended 9 Months Ended
Oct. 04, 2019
USD ($)
Sep. 26, 2020
USD ($)
Sep. 28, 2019
USD ($)
Sep. 26, 2020
USD ($)
reporting_unit
Sep. 28, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Severance costs       $ 3,007,000 $ 0
Number of reporting units impaired | reporting_unit       4  
Impairment Loss       $ 86,312,000  
Right-of-Use Asset Impairment   $ 0 $ 0 691,000 0
Equity Investment Other Than Temporary Impairment   3,500,000   3,493,000 $ 0
Fair Value, Inputs, Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Severance costs   200,000   2,600,000  
Aerospace Segment          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Severance costs   $ 200,000   5,200,000  
Impairment Loss       86,300,000  
AeroSat          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Right-of-Use Asset Impairment       $ 700,000  
Diagnosys          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Potential additional earn-out $ 13,000,000.0        
Achievement period 3 years        
Earn-out achievement benchmark $ 72,000,000.0