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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options	12 Months Ended
	Sep. 30, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	395,349
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 18.45
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 7 months 6 days
Options Exercisable, Number (in shares) | shares	236,157
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.31
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 1 month 6 days
$ 4.01
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	1,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.01
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	1 year 2 months 12 days
Options Exercisable, Number (in shares) | shares	1,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.01
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	1 year 2 months 12 days
Exercise price range, lower range limit (in dollars per share)	$ 4.01
5.86
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	19,100
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.97
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 1 month 6 days
Options Exercisable, Number (in shares) | shares	19,100
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.97
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 1 month 6 days
Exercise price range, lower range limit (in dollars per share)	$ 5.86
Exercise price range, upper range limit (in dollars per share)	$ 6.00
9.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	37,425
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 1 month 6 days
Options Exercisable, Number (in shares) | shares	37,425
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 1 month 6 days
Exercise price range, lower range limit (in dollars per share)	$ 9.00
10.26
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	89,064
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.59
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 7 months 6 days
Options Exercisable, Number (in shares) | shares	89,064
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.59
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	4 years 7 months 6 days
Exercise price range, lower range limit (in dollars per share)	$ 10.26
Exercise price range, upper range limit (in dollars per share)	$ 10.71
15.67
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	110,150
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 16.41
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 6 months
Options Exercisable, Number (in shares) | shares	32,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years
Exercise price range, lower range limit (in dollars per share)	$ 15.67
Exercise price range, upper range limit (in dollars per share)	$ 16.87
26.50
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	45,240
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 27.13
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	9 years
Options Exercisable, Number (in shares) | shares	8,848
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 27.14
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	9 years
Exercise price range, lower range limit (in dollars per share)	$ 26.50
Exercise price range, upper range limit (in dollars per share)	$ 27.14
29.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	51,800
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years
Options Exercisable, Number (in shares) | shares	31,400
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 years
Exercise price range, lower range limit (in dollars per share)	$ 29.69
31.80
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	41,570
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years
Options Exercisable, Number (in shares) | shares	16,820
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 31.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	8 years
Exercise price range, lower range limit (in 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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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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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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The ceiling 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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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.

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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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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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