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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
shares in Thousands
3 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 369,720
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 16.14
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 9 months 21 days
Options Exercisable, Number (shares) | shares 194,870
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 10.90
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 7 months 18 days
$4.01 - $4.55  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 2,500
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 4.33
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 8 months
Options Exercisable, Number (shares) | shares 2,500
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 4.33
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 1 year 8 months
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 27,850
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 5.96
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 9 months 21 days
Options Exercisable, Number (shares) | shares 27,850
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 5.96
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 3 years 9 months 21 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 68,000
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 30 days
Options Exercisable, Number (shares) | shares 68,000
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 30 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 118,420
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 10.57
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 3 months 15 days
Options Exercisable, Number (shares) | shares 66,120
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 10.56
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 6 years 2 months 21 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 50,700
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 9 months
Options Exercisable, Number (shares) | shares 18,900
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 7 years 9 months
Weighted Average Exercise Price, minimum (dollars per share) $ 15.67
$29.69  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (shares) | shares 56,300
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 9 months
Options Exercisable, Number (shares) | shares 11,500
Options Exercisable, Weighted Average Exercise Price (dollars per share) $ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 8 years 9 months
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 45,950
Options Outstanding, Weighed Average Exercise Price (dollars per share) $ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 9 years 9 months
Options Exercisable, Number (shares) | shares 0
Weighted Average Exercise Price, minimum (dollars per share) $ 31.80