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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
shares in Thousands
 9 Months Ended
Jun. 30, 2025
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 252,980
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 26.02
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 10 months 24 days
Options Exercisable, Number (shares) | shares 183,550
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 25.93
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 2 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 4,750
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 10.71
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 months 18 days
Options Exercisable, Number (shares) | shares 4,750
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 10.71
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 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 47,550
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 16.55
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 2 months 12 days
Options Exercisable, Number (shares) | shares 37,720
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 16.46
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 3 years 10 months 24 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 82,960
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 27.32
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 18 days
Options Exercisable, Number (shares) | shares 46,960
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 27.26
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 7 months 6 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 89,000
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 28.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 8 months 12 days
Options Exercisable, Number (shares) | shares 66,000
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 28.99
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 2 months 12 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 28,720
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 31.86
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 4 months 24 days
Options Exercisable, Number (shares) | shares 28,120
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 31.35
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 3 years 3 months 18 days