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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Cash dividends declared on common stock (in dollars per share) $ 0.20 $ 0.20 $ 0.20
Accounting Standards Update 2014-09      
Accounting Standards Update [Extensible Enumeration]     Accounting Standards Update 2014-09
Accounting Standards Update 2016-01      
Accounting Standards Update [Extensible Enumeration]     Accounting Standards Update 2016-01
Accounting Standards Update 2016-13      
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2016-13