Long-term and Short-term Debt - Narrative (Details) $ in Millions		12 Months Ended
	Jun. 29, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Apr. 25, 2024 USD ($)	Jun. 28, 2022 USD ($)
Debt Instrument [Line Items]
Short-term debt		$ 770.8	$ 94.7
Interest payments		153.2	133.2	$ 120.4
Notes Payable, Other Payables | $300.0 Million Dollar Note Due 2025
Debt Instrument [Line Items]
Total debt		300.0
Notes Payable, Other Payables | $250.0 Million Dollar Note Due 2028
Debt Instrument [Line Items]
Total debt		250.0
Notes Payable, Other Payables | $425.0 Million Dollar Note Due 2029
Debt Instrument [Line Items]
Total debt		425.0
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, term	5 years
Borrowing capacity	$ 750.0
Line of credit facility, current borrowing capacity	$ 1,500.0					$ 1,250.0
Maximum ratio of EBITDA to interest expense under credit facility	3.0
Commercial Paper
Debt Instrument [Line Items]
Short-term debt		$ 657.0
Debt, weighted average interest rate (in percent)		514.00%
Debt instrument, term		24 days
Line of Credit
Debt Instrument [Line Items]
Borrowing capacity		$ 75.0
Unsecured line of credit, amount borrowed		$ 70.0	$ 70.0
Stated interest rate (in percent)		6.17%	6.29%
Interest Bearing Loan
Debt Instrument [Line Items]
Short-term debt		$ 23.5	$ 23.5		$ 18.8
Foreign Line of Credit
Debt Instrument [Line Items]
Borrowing capacity		248.5
Letter of Credit
Debt Instrument [Line Items]
Borrowing capacity		$ 34.6