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Borrowings - Long-term Debt (Narrative) (Details)
 12 Months Ended
Oct. 07, 2022
USD ($)
Jan. 20, 2021
USD ($)
Jan. 20, 2021
GBP (£)
Dec. 16, 2020
Mar. 27, 2019
USD ($)
tranche
Sep. 30, 2022
USD ($)
case
Oct. 01, 2021
USD ($)
Oct. 02, 2020
USD ($)
Mar. 25, 2020
USD ($)
Mar. 25, 2020
GBP (£)
Mar. 12, 2018
USD ($)
series
Feb. 07, 2014
USD ($)
Line of Credit Facility [Line Items]                        
Proceeds from long-term borrowings           $ 3,145,500,000 $ 4,445,080,000 $ 2,986,661,000        
Total long-term debt, net           3,357,256,000 2,839,933,000          
Number of senior debt | series                     3  
Treasury Lock                        
Line of Credit Facility [Line Items]                        
Aggregate principal amount           $ 250,000,000            
Number of instruments held | case           2            
Senior Notes                        
Line of Credit Facility [Line Items]                        
Debt outstanding           $ 19,000,000            
Contingent interest rate (in basis points)                     0.75%  
Minimum                        
Line of Credit Facility [Line Items]                        
Facility fee percentage           0.08%            
Maximum                        
Line of Credit Facility [Line Items]                        
Facility fee percentage           0.23%            
Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Number of tranches in revolving credit facility | tranche         2              
Total long-term debt, net           $ 1,105,294,000 $ 327,794,000          
Long-term debt fair value           $ 498,300,000            
Revolving Credit Facility | Senior Notes | Subsequent Event                        
Line of Credit Facility [Line Items]                        
Repayments of senior debt $ 481,000,000                      
Revolving Credit Facility | Maximum | LIBOR                        
Line of Credit Facility [Line Items]                        
Margin added to variable rate interest rate           4.08% 1.45%          
First Amendment to the Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Consolidated leverage ratio       3.00                
First Amendment to the Revolving Credit Facility | LIBOR                        
Line of Credit Facility [Line Items]                        
Margin added to variable rate interest rate       1.625%                
Letter of Credit                        
Line of Credit Facility [Line Items]                        
Credit facility, maximum borrowing capacity           $ 400,000,000            
Sub Facility Of Swing Line Loans                        
Line of Credit Facility [Line Items]                        
Credit facility, maximum borrowing capacity           50,000,000            
$1.6 Billion Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Credit facility, maximum borrowing capacity                       $ 1,600,000,000
Available borrowing capacity           1,140,000,000            
$1.6 Billion Revolving Credit Facility | Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Credit facility, maximum borrowing capacity         $ 2,250,000,000              
Accordion feature of loan         $ 3,250,000,000              
$1.6 Billion Revolving Credit Facility | Letter of Credit                        
Line of Credit Facility [Line Items]                        
Direct borrowings on credit facility           1,300,000            
Term Loan Facility 2020                        
Line of Credit Facility [Line Items]                        
Aggregate principal amount                 $ 730,000,000      
Total long-term debt, net           $ 882,263,000 $ 988,940,000          
Term Loan Facility 2020 | Subsidiaries                        
Line of Credit Facility [Line Items]                        
Aggregate principal amount | £                   £ 250,000,000    
Term Loan Facility 2020 | Maximum | LIBOR                        
Line of Credit Facility [Line Items]                        
Margin added to variable rate interest rate           4.49% 1.45%          
2021 Term Loan Facility                        
Line of Credit Facility [Line Items]                        
Proceeds from long-term borrowings   $ 200,000,000 £ 650,000,000                  
Senior Notes As Amended Note Purchase Agreement                        
Line of Credit Facility [Line Items]                        
Total long-term debt, net                     $ 500,000,000  
Committed And Uncommitted Letter Of Credit Facility | Letter of Credit                        
Line of Credit Facility [Line Items]                        
Direct borrowings on credit facility           $ 279,200,000            
Line of Credit                        
Line of Credit Facility [Line Items]                        
Letters of credit outstanding           $ 280,500,000