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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options shares in Thousands	6 Months Ended
	Mar. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	346,504
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 16.59
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 8 months 3 days
Options Exercisable, Number (shares) | shares	176,854
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 11.08
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 5 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 5 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 5 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	24,850
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 5.97
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 6 months 24 days
Options Exercisable, Number (shares) | shares	24,850
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 5.97
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 6 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 6 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 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	115,129
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 10.58
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 21 days
Options Exercisable, Number (shares) | shares	68,029
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 10.55
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 11 months
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	49,200
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 6 months
Options Exercisable, Number (shares) | shares	17,400
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 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	56,100
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 6 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 6 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 6 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.

+ 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.

+ 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 (c)(iii)
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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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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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