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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
 12 Months Ended
Sep. 30, 2024
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 306,240
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 25.21
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 4 months 24 days
Options Exercisable, Number (in shares) | shares 229,010
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 24.86
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 days
10.26 - 10.71  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, lower range limit (in dollars per share) $ 10.26
Exercise price range, upper range limit (in dollars per share) $ 10.71
Options Outstanding, Number (in shares) | shares 20,750
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 10.62
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 9 months 18 days
Options Exercisable, Number (in shares) | shares 20,750
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 10.62
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 9 months 18 days
15.67 - 19.13  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, lower range limit (in dollars per share) $ 15.67
Exercise price range, upper range limit (in dollars per share) $ 19.13
Options Outstanding, Number (in shares) | shares 55,450
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 16.60
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 1 month 6 days
Options Exercisable, Number (in shares) | shares 44,520
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 16.53
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 days
26.50 - 27.14  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, lower range limit (in dollars per share) $ 26.5
Exercise price range, upper range limit (in dollars per share) $ 27.40
Options Outstanding, Number (in shares) | shares 97,220
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 27.32
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years
Options Exercisable, Number (in shares) | shares 57,320
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 27.26
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 6 years 4 months 24 days
28.23 - 29.69  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, lower range limit (in dollars per share) $ 28.23
Exercise price range, upper range limit (in dollars per share) $ 29.69
Options Outstanding, Number (in shares) | shares 99,900
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 28.78
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 6 months
Options Exercisable, Number (in shares) | shares 74,300
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 28.97
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years
31.80  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, lower range limit (in dollars per share) $ 31.8
Exercise price range, upper range limit (in dollars per share) $ 33.40
Options Outstanding, Number (in shares) | shares 32,920
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 31.85
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 1 month 6 days
Options Exercisable, Number (in shares) | shares 32,120
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 31.60
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years