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Revenue from Contracts with Customers Revenue from Contracts with Customers (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 29, 2019
Jun. 29, 2019
Sep. 30, 2018
Sep. 29, 2018
Disaggregation of Revenue [Line Items]        
Revenue for adjustments made to performance obligations satisified in prior year $ 3,898 $ 14,336    
Contract loss and contract-related reserves 57,556 57,556 $ 49,847 $ 47,417
Revenue recognized due to contract liabilities 17,446 111,032    
Remaining performance obligation, amount $ 2,150,000 $ 2,150,000    
Remaining performance obligation, percentage 74.00% 74.00%    
Remaining performance obligation, expected timing of satisfaction 12 months 12 months    
Transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue, net percent 64.00% 64.00%    
Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Revenue, net percent 36.00% 36.00%    
Minimum        
Disaggregation of Revenue [Line Items]        
Payment terms   30    
Maximum        
Disaggregation of Revenue [Line Items]        
Payment terms   60 days