Derivative Instruments - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Aug. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Maximum length of time hedged in cash flow hedge	2 years
Net unrealized gains on cash flow hedges to be reclassified into earnings during the next 12 months	$ 19,400,000
Notes Payable, Other Payables
Derivative Instruments, Gain (Loss) [Line Items]
Debt instrument, face amount		$ 1,500,000,000	$ 1,000,000,000	$ 1,000,000,000
Forward exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
U.S. dollar-equivalent gross notional amount	2,254,000,000
Forward exchange contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
U.S. dollar-equivalent gross notional amount	1,178,100,000
Cash Flow Hedging | Forward exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
U.S. dollar-equivalent gross notional amount	1,075,900,000
Net Investment Hedging | Forward exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
U.S. dollar-equivalent gross notional amount	$ 0