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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
shares in Thousands
 6 Months Ended
Mar. 31, 2024
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 329,110
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 24.95
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 9 months 18 days
Options Exercisable, Number (shares) | shares 207,290
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 24.43
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 8 months 12 days
$10.26 - $10.71  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Exercise Price, minimum (dollars per share) $ 10.26
Weighted Average Exercise Price, maximum (dollars per share) $ 10.71
Options Outstanding, Number (shares) | shares 26,250
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 10.62
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 3 months 18 days
Options Exercisable, Number (shares) | shares 26,250
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 10.62
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 1 year 3 months 18 days
$15.67 - $19.13  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Exercise Price, minimum (dollars per share) $ 15.67
Weighted Average Exercise Price, maximum (dollars per share) $ 19.13
Options Outstanding, Number (shares) | shares 60,800
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 16.56
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 4 months 24 days
Options Exercisable, Number (shares) | shares 39,140
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 16.37
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 days
$26.50 - $27.25  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Exercise Price, minimum (dollars per share) $ 26.5
Weighted Average Exercise Price, maximum (dollars per share) $ 27.4
Options Outstanding, Number (shares) | shares 101,140
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 27.31
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 6 months
Options Exercisable, Number (shares) | shares 41,380
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 27.23
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 6 years 6 months
$28.23 - $29.69  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Exercise Price, minimum (dollars per share) $ 28.23
Weighted Average Exercise Price, maximum (dollars per share) $ 29.69
Options Outstanding, Number (shares) | shares 106,600
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 28.79
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years
Options Exercisable, Number (shares) | shares 67,000
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 29.12
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 1 month 6 days
$31.80  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Exercise Price, minimum (dollars per share) $ 31.8
Weighted Average Exercise Price, maximum (dollars per share) $ 33.4
Options Outstanding, Number (shares) | shares 34,320
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 31.85
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 7 months 6 days
Options Exercisable, Number (shares) | shares 33,520
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 31.61
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 6 months