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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
shares in Thousands
9 Months Ended
Jun. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 332,279
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 18.88
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 1 month 6 days
Options Exercisable, Number (shares) | shares 190,709
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 13.46
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 days
$4.01 - $4.55  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 1,000
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 4.01
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 4 months 24 days
Options Exercisable, Number (shares) | shares 1,000
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 4.01
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 1 year 4 months 24 days
Weighted Average Exercise Price, minimum (dollars per share) $ 4.01
Weighted Average Exercise Price, maximum (dollars per share) $ 4.55
$5.86 - $6.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 19,100
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 5.97
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 3 months 18 days
Options Exercisable, Number (shares) | shares 19,100
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 5.97
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 2 years 3 months 18 days
Weighted Average Exercise Price, minimum (dollars per share) $ 5.86
Weighted Average Exercise Price, maximum (dollars per share) $ 6.00
$9.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 37,425
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 3 months 18 days
Options Exercisable, Number (shares) | shares 37,425
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 3 years 3 months 18 days
Weighted Average Exercise Price, minimum (dollars per share) $ 9.00
$10.26 - $10.71  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 89,464
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 10.59
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 days
Options Exercisable, Number (shares) | shares 80,414
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 10.58
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 18 days
Weighted Average Exercise Price, minimum (dollars per share) $ 10.26
Weighted Average Exercise Price, maximum (dollars per share) $ 10.71
$15.67  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 42,800
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 18 days
Options Exercisable, Number (shares) | shares 23,000
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 18 days
Weighted Average Exercise Price, minimum (dollars per share) $ 15.67
$26.50 - $27.14  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 46,640
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 27.13
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 9 years 3 months 18 days
Options Exercisable, Number (shares) | shares 0
Weighted Average Exercise Price, minimum (dollars per share) $ 26.50
Weighted Average Exercise Price, maximum (dollars per share) $ 27.14
$29.69  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 53,000
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 3 months 18 days
Options Exercisable, Number (shares) | shares 21,200
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 7 years 3 months 18 days
Weighted Average Exercise Price, minimum (dollars per share) $ 29.69
$31.80  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 42,850
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 3 months 18 days
Options Exercisable, Number (shares) | shares 8,570
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 31.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 8 years 3 months 18 days
Weighted Average Exercise Price, minimum (dollars per share) $ 31.80