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Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]          
Accounting Standards Update [Extensible List]         us-gaap:AccountingStandardsUpdate201613Member
Cash dividends declared on common stock (in dollars per share) $ 0.05 $ 0.05 $ 0.15 $ 0.15