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Stock Compensation Plans And Stock Based Compensation: Schedule of Fair Value Assumptions (Details)
6 Months Ended
Mar. 31, 2021
$ / shares
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Expected volatility (percent) 33.00%
Expected term (in years) 5 years
Expected dividend yield (percent) 4.76%
Risk free interest rate (percent) 0.38%
Grant date fair value per share (dollars per share) $ 3.26