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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. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Sep. 28, 2019
Disaggregation of Revenue [Line Items]          
Revenue for adjustments made to performance obligations satisified in prior year $ (6,023) $ 3,898 $ 3,655 $ 14,336  
Contract loss and contract-related reserves 67,384   67,384   $ 60,914
Revenue recognized due to contract liabilities 10,016   71,556    
Remaining performance obligation, amount $ 2,522,000   $ 2,522,000    
Remaining performance obligation, percentage 66.00%   66.00%    
Transferred over time          
Disaggregation of Revenue [Line Items]          
Revenue, net percent 66.00%   65.00%    
Transferred at Point in Time          
Disaggregation of Revenue [Line Items]          
Revenue, net percent 34.00%   35.00%    
Minimum          
Disaggregation of Revenue [Line Items]          
Payment terms     30    
Maximum          
Disaggregation of Revenue [Line Items]          
Payment terms     60 days    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-03-28          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Remaining performance obligation, expected timing of satisfaction 12 months   12 months