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Financial Instruments - Narrative (Details) € in Millions, ¥ in Billions	Sep. 30, 2025 EUR (€)	Sep. 30, 2025 JPY (¥)	Sep. 30, 2024 EUR (€)	Sep. 30, 2024 JPY (¥)
2.90% Senior Notes Due 2030 \| Senior Notes
Derivative [Line Items]
Aggregate principal amount (in EUR)	€ 700
Interest rate (as percent)	2.90%	2.90%
Cross-Currency Swap Contracts
Derivative [Line Items]
Notional amount of derivative \| ¥		¥ 2.1		¥ 2.1
Cross-Currency Swap Contract One
Derivative [Line Items]
Notional amount of derivative	€ 69		€ 69
Cross-Currency Swap Contract Two
Derivative [Line Items]
Notional amount of derivative	€ 290		€ 290