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Derivative Instruments and Hedging Activities - Narrative (Details)
€ in Millions
12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
EUR (€)
Derivative [Line Items]        
Hedge percentage for foreign exchange transactional exposures, minimum 70.00%      
Hedge percentage for foreign exchange transactional exposures, maximum 90.00%      
Pre-tax gains (losses) related to net investment hedges reclassified from other comprehensive income $ 0 $ 0 $ 0  
Interest rate swaps        
Derivative [Line Items]        
Derivative, notional amount $ 600,000,000     € 400