Derivative Instruments - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2025 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Maximum length of time hedged in cash flow hedge	2 years
Net unrealized gains (losses) on cash flow hedges to be reclassified into earnings during the next 12 months	$ 15.0
Forward exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
U.S. dollar-equivalent gross notional amount	1,552.0
Forward exchange contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
U.S. dollar-equivalent gross notional amount	799.0
Cash Flow Hedging | Forward exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
U.S. dollar-equivalent gross notional amount	753.0
Cash Flow Hedging | Currency Swap
Derivative Instruments, Gain (Loss) [Line Items]
U.S. dollar-equivalent gross notional amount	$ 800.0