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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
 12 Months Ended
Sep. 30, 2025
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 215,530
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 26.22
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 days
Options Exercisable, Number (in shares) | shares 180,230
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 25.92
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 6 months
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 42,150
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 16.54
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 10 months 24 days
Options Exercisable, Number (in shares) | shares 42,050
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 16.53
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 3 years 10 months 24 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 73,260
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 27.33
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 2 months 12 days
Options Exercisable, Number (in shares) | shares 49,860
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 27.30
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 10 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 76,900
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 28.75
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 7 months 6 days
Options Exercisable, Number (in shares) | shares 65,700
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 28.84
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 3 months 18 days
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 23,220
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 31.87
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 2 months 12 days
Options Exercisable, Number (in shares) | shares 22,620
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 31.24
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 3 years 1 month 6 days