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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
shares in Thousands
 9 Months Ended
Jun. 30, 2024
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 322,390
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 24.87
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 7 months 6 days
Options Exercisable, Number (shares) | shares 200,570
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 24.29
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 6 months
$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
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
$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 60,500
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 16.55
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 2 months 12 days
Options Exercisable, Number (shares) | shares 38,840
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 16.37
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 7 months 6 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 98,820
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 27.31
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 3 months 18 days
Options Exercisable, Number (shares) | shares 39,060
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 27.23
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 18 days
$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 103,900
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 28.79
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 8 months 12 days
Options Exercisable, Number (shares) | shares 64,300
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 29.13
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 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 32,920
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 31.85
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 4 months 24 days
Options Exercisable, Number (shares) | shares 32,120
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 31.60
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 3 months 18 days