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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
shares in Thousands
6 Months Ended
Mar. 31, 2023
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 392,270
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 23.50
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 18 days
Options Exercisable, Number (shares) | shares 202,360
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 21.35
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 4 months 24 days
$9.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Exercise Price, minimum (dollars per share) $ 9
Options Outstanding, Number (shares) | shares 14,000
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 months 6 days
Options Exercisable, Number (shares) | shares 14,000
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 7 months 6 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 45,000
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 10.55
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 10 months 24 days
Options Exercisable, Number (shares) | shares 45,000
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 10.55
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 1 year 10 months 24 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 75,500
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 16.54
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 18 days
Options Exercisable, Number (shares) | shares 38,810
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 16.19
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 2 months 12 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 108,820
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 27.31
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 6 months
Options Exercisable, Number (shares) | shares 20,740
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 27.14
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 113,150
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 28.78
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years
Options Exercisable, Number (shares) | shares 55,950
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 29.35
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 4 months 24 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 35,800
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 31.84
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 7 months 6 days
Options Exercisable, Number (shares) | shares 27,860
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 31.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 6 months