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Revenue from Contracts with Customers Revenue from Contracts with Customers (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Mar. 28, 2020
Mar. 30, 2019
Sep. 28, 2019
Disaggregation of Revenue [Line Items]          
Revenue for adjustments made to performance obligations satisified in prior year $ (4,941) $ (1,321) $ 9,678 $ 10,438  
Contract loss and contract-related reserves 65,409   65,409   $ 60,914
Revenue recognized due to contract liabilities 25,780   61,540    
Remaining performance obligation, amount $ 2,603,000   $ 2,603,000    
Remaining performance obligation, percentage 69.00%   69.00%    
Transferred over time          
Disaggregation of Revenue [Line Items]          
Revenue, net percent 65.00%   64.00%    
Transferred at Point in Time          
Disaggregation of Revenue [Line Items]          
Revenue, net percent 35.00%   36.00%    
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