CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) (Parenthetical) - $ / shares  | 
3 Months Ended | |
|---|---|---|
Dec. 31, 2021  | 
Dec. 31, 2020  | 
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| Statement Of Stockholders Equity [Abstract] | ||
| Cash dividends declared per common share | $ 0.50 | $ 0.18 | 
| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
- References No definition available. 
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