Derivative Financial Instruments (Pretax Gains and Losses on Derivative Contracts Designated as Hedging Instruments Recognized in OCI and Reclassifications from AOCI to Earnings) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Sep. 27, 2020
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	$ 7.7	$ 32.4
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	(30.2)	23.7
Net Investment Hedging [Member] | Cross-Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives used in Net Investment Hedge, Net of Tax	17.9		$ 32.6
Net Investment Hedging [Member] | Foreign Currency Contract - Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives used in Net Investment Hedge, Net of Tax	16.0		16.0
Net Investment Hedging [Member] | ForeignExchangeYenDebt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives used in Net Investment Hedge, Net of Tax	(47.4)		$ (37.1)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Coffee Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	12.0	11.0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Cross-Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	(3.4)	6.2
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Dairy Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	2.5	(0.1)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Currency Contract - Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	(25.9)	(4.7)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	22.5	20.0
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Cross-Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	(16.5)	10.7
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | ForeignExchangeYenDebt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Recognized in OCI Before Reclassifications	(13.7)	13.0
Gains/(Losses) Reclassified from AOCI to Earnings	0.0	0.0
Product and distribution costs | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Coffee Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Reclassified from AOCI to Earnings	0.7	0.0
Product and distribution costs | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Dairy Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Reclassified from AOCI to Earnings	2.6	0.0
Product and distribution costs | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Currency Contract - Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Reclassified from AOCI to Earnings	0.0	(0.3)
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Cross-Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Reclassified from AOCI to Earnings	1.0	(0.2)
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Reclassified from AOCI to Earnings	(0.6)	0.8
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Cross-Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Reclassified from AOCI to Earnings	3.2	3.3
Interest and Other Income [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Cross-Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Reclassified from AOCI to Earnings	(4.8)	5.6
Franchised Units Revenue [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Currency Contract - Other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) Reclassified from AOCI to Earnings	$ 0.0	$ 1.7