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Stock Compensation Plans: Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Number of Shares      
Options outstanding, beginning of period (in shares) 369,150 421,925 406,815
Options granted (in shares) 0 1,000 74,000
Options exercised (in shares) (45,150) (42,635) (36,720)
Options forfeited (in shares) (17,760) (11,140) (22,170)
Options outstanding, end of period (in shares) 306,240 369,150 421,925
Weighted Average Exercise Price      
Options outstanding, beginning of period (in dollars per share) $ 24.00 $ 23.30 $ 21.62
Options granted (in dollars per share) 0 33.40 27.40
Options exercised (in dollars per share) 14.61 16.38 11.31
Options forfeited (in dollars per share) 27.07 27.26 26.01
Options outstanding, end of period (in dollars per share) $ 25.21 $ 24.00 $ 23.30