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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options shares in Thousands	3 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	369,570
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 13.31
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 2 months 9 days
Options Exercisable, Number (shares) | shares	166,320
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 8.83
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 11 months 24 days
$4.01 - $4.55
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	10,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 4.28
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 10 months 15 days
Options Exercisable, Number (shares) | shares	10,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 4.28
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 10 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	39,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 5.94
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 9 months 15 days
Options Exercisable, Number (shares) | shares	39,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 5.94
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	4 years 9 months 15 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	78,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 9 months 30 days
Options Exercisable, Number (shares) | shares	59,800
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 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	131,520
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 10.57
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 3 months 15 days
Options Exercisable, Number (shares) | shares	48,070
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 10.56
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 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	53,050
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 9 months
Options Exercisable, Number (shares) | shares	9,450
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	8 years 10 months 6 days
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 9 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
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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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-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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+ References

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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