Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value - Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Details)
3 Months Ended 6 Months Ended
Oct. 04, 2019
USD ($)
Jun. 27, 2020
USD ($)
Jun. 29, 2019
USD ($)
Jun. 27, 2020
USD ($)
reporting_unit
Jun. 29, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Severance costs       $ 4,669,000 $ 377,000
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   2,100,000   2,400,000  
Aerospace Segment          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Severance costs   4,800,000   5,000,000.0  
Impairment Loss   $ 12,600,000   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