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Revenue from Contracts with Customers - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]      
Capitalized Contract Cost, Amortization $ 38,238,000 $ 35,383,000 $ 37,712,000
Capitalized Contract Cost, Impairment Loss $ 0 $ 0 $ 0