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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options shares in Thousands	9 Months Ended
	Jun. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	339,164
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 16.79
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 5 months 21 days
Options Exercisable, Number (shares) | shares	183,414
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 11.18
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 3 months 12 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 2 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 2 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	19,850
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 5.97
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 3 months 24 days
Options Exercisable, Number (shares) | shares	19,850
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 5.97
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 3 months 24 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	52,775
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 3 months 30 days
Options Exercisable, Number (shares) | shares	52,775
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	4 years 3 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	113,189
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 10.58
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 9 months 18 days
Options Exercisable, Number (shares) | shares	79,989
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 10.55
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 8 months 9 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	48,800
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 3 months
Options Exercisable, Number (shares) | shares	17,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 years 3 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	56,100
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 3 months
Options Exercisable, Number (shares) | shares	11,300
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	8 years 3 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 3 months
Options Exercisable, Number (shares) | shares	0
Weighted Average Exercise Price, minimum (dollars per share)	$ 31.80

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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