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Joint Ventures and VIE's (Schedule of Summarized Financial Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2021
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
Schedule of Equity Method Investments [Line Items]        
Current assets $ 4,291,895 $ 4,539,599    
Total assets 14,632,609 12,354,353    
Current liabilities 3,209,924 2,941,597    
Joint ventures' equity 5,974,837 5,855,667 $ 5,768,658 $ 5,944,354
Total liabilities and stockholders' equity 14,632,609 12,354,353    
Gross profit 3,043,772 2,586,668 2,477,028  
Net earnings 430,829 523,867 873,219  
Consolidated Entities        
Schedule of Equity Method Investments [Line Items]        
Revenue 1,037,300 912,900 571,600  
Direct cost of contracts (910,100) (807,900) (526,700)  
Gross profit 127,200 105,000 44,900  
Net earnings 84,300 72,600 45,200  
VIE, primary beneficiary | Consolidated Entities        
Schedule of Equity Method Investments [Line Items]        
Current assets 289,700 261,600    
Non-Current assets 100 200    
Total assets 289,800 261,800    
Current liabilities 220,800 190,300    
Non-current liabilities 0 0    
Total liabilities 220,800 190,300    
VIE, not primary beneficiary | Unconsolidated Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Current assets 937,900 1,697,000    
Non-Current assets 42,000 34,900    
Total assets 979,900 1,731,900    
Current liabilities 769,200 889,700    
Non-current liabilities 33,700 631,000    
Total liabilities 802,900 1,520,700    
Joint ventures' equity 177,000 211,200    
Total liabilities and stockholders' equity 979,900 1,731,900    
Revenue 3,299,900 3,447,000 3,533,100  
Direct cost of contracts (3,014,200) (3,126,600) (3,176,200)  
Gross profit 285,700 320,400 356,900  
Net earnings $ 207,500 $ 245,300 $ 227,000