Commitments and Contingencies and Derivative Financial Instruments (Details) $ in Millions		3 Months Ended		12 Months Ended
	Feb. 13, 2023 USD ($)	Sep. 26, 2025 USD ($)	Sep. 27, 2024 USD ($) instrument	Sep. 26, 2025 USD ($)	Sep. 27, 2024 USD ($) instrument	Oct. 02, 2020	Feb. 06, 2023 USD ($)	Sep. 30, 2022 USD ($) derivative_agreement
Letter of Credit
Loss Contingencies [Line Items]
Credit facility, maximum borrowing capacity							$ 400.0
Letter of Credit | Unsecured Revolving Credit Facility February 6, 2023
Loss Contingencies [Line Items]
Credit facility, maximum borrowing capacity		$ 0.3		$ 0.3
Letter of Credit | Committed And Uncommitted Letter Of Credit Facility
Loss Contingencies [Line Items]
Credit facility, maximum borrowing capacity		216.7		216.7
Surety Bond
Loss Contingencies [Line Items]
Short-term debt		2,800.0	$ 2,300.0	2,800.0	$ 2,300.0
Treasury Lock
Loss Contingencies [Line Items]
Number of instruments held | derivative_agreement								2
Derivative, notional amount								$ 500.0
Realized gain on derivatives	$ 37.4
Unrealized gain (loss) on derivatives				20.9	$ 23.6
Treasury Lock | Fixed Rate Date
Loss Contingencies [Line Items]
Derivative, fixed interest rate	5.90%
Aggregate principal amount	$ 500.0
Interest Rate Swap
Loss Contingencies [Line Items]
Number of instruments held | instrument			1		1
Derivative, notional amount			$ 200.0		$ 200.0
Unrealized gain (loss) on derivatives				15.6
Term of contract					10 years
Number of instruments terminated | instrument					2
Derivative instrument terminated, notional amount					$ 554.7
Derivative, gain on derivative		35.2	35.2		35.2
Interest Rate Swap | Minimum
Loss Contingencies [Line Items]
Term of contract						5 years
Interest Rate Swap | Maximum
Loss Contingencies [Line Items]
Term of contract						10 years
Cross Currency Interest Rate Contract and Interest Rate Swamp
Loss Contingencies [Line Items]
Derivative assets (liabilities), at fair value		20.5	23.0	20.5	23.0
Interest Rate Swap and Cross Currency Interest Rate Contract
Loss Contingencies [Line Items]
Unrealized gain (loss) on derivatives					17.4
Foreign Exchange Forward
Loss Contingencies [Line Items]
Derivative, notional amount		491.9	827.3	491.9	827.3
Derivative assets (liabilities), at fair value		(0.3)	15.3	(0.3)	15.3
Foreign Exchange Forward | Assets, Current
Loss Contingencies [Line Items]
Derivative assets (liabilities), at fair value		2.0	15.8	2.0	15.8
Foreign Exchange Forward | Liabilities, Current
Loss Contingencies [Line Items]
Derivative assets (liabilities), at fair value		$ (2.3)	$ (0.5)	$ (2.3)	$ (0.5)
Foreign Exchange Forward | Minimum
Loss Contingencies [Line Items]
Term of contract				1 month
Foreign Exchange Forward | Maximum
Loss Contingencies [Line Items]
Term of contract				3 months