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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options shares in Thousands	6 Months Ended
	Mar. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	346,320
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 13.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 24 days
Options Exercisable, Number (shares) | shares	148,270
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 9.06
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 9 months 30 days
$4.01 - $4.55
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	6,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 4.28
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 7 months 15 days
Options Exercisable, Number (shares) | shares	6,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 4.28
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 7 months 15 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	30,900
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 5.95
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 6 months 21 days
Options Exercisable, Number (shares) | shares	30,900
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 5.95
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	4 years 6 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	73,900
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 6 months 30 days
Options Exercisable, Number (shares) | shares	55,700
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 6 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	124,920
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 10.58
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 18 days
Options Exercisable, Number (shares) | shares	46,670
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 10.54
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years 10 months 12 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	52,600
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 6 months
Options Exercisable, Number (shares) | shares	9,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	8 years 6 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	58,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	9 years 6 months
Options Exercisable, Number (shares) | shares	0
Weighted Average Exercise Price, minimum (dollars per share)	$ 29.69

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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-Publisher FASB
-Name Accounting Standards Codification
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