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Revenue from Contracts with Customers (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Oct. 01, 2022
Oct. 02, 2021
Disaggregation of Revenue [Line Items]      
Contract with Customer, Performance Obligation Satisfied in Previous Period $ (3,095) $ (3,518) $ 11,167
Contract reserves 45,257 46,547  
Contract with Customer, Liability, Revenue Recognized 263,933    
Revenue, Remaining Performance Obligation, Amount $ 5,100,000    
Revenue, Remaining Performance Obligation, Percentage 47.00%    
Unbilled receivables $ 706,601 614,760  
U.S. Plans      
Disaggregation of Revenue [Line Items]      
Unbilled receivables $ 79,388 $ 38,020  
Minimum      
Disaggregation of Revenue [Line Items]      
Revenue, Performance Obligation, Description of Payment Terms 30    
Maximum      
Disaggregation of Revenue [Line Items]      
Revenue, Performance Obligation, Description of Payment Terms 60 days    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 12 months