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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Common stock dividends (in dollars per share) $ 1.02 $ 0.95 $ 1.01
Accounting Standards Update [Extensible Enumeration]   Accounting Standards Update 2016-13 [Member]