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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]    
Dividends declared (in dollars per share) $ 1.00  
Dividends declared, supplemental (in dollars per share) $ 0.940  
Accounting Standards Update [Extensible List]   Accounting Standards Update 2016-13 [Member]