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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options	12 Months Ended
	Sep. 30, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	421,925
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 23.30
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 9 months 18 days
Options Exercisable, Number (in shares) | shares	230,015
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 21.25
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years
9.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 9
Options Outstanding, Number (in shares) | shares	14,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	1 year 1 month 6 days
Options Exercisable, Number (in shares) | shares	14,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	1 year 1 month 6 days
10.26 - 10.71
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 10.26
Exercise price range, upper range limit (in dollars per share)	$ 10.71
Options Outstanding, Number (in shares) | shares	50,575
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.56
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 6 months
Options Exercisable, Number (in shares) | shares	50,575
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.56
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 6 months
15.67 - 19.13
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 15.67
Exercise price range, upper range limit (in dollars per share)	$ 19.13
Options Outstanding, Number (in shares) | shares	86,900
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 16.54
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 9 months 18 days
Options Exercisable, Number (in shares) | shares	49,410
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 16.25
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 10 months 24 days
26.50 - 27.14
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 26.5
Exercise price range, upper range limit (in dollars per share)	$ 27.40
Options Outstanding, Number (in shares) | shares	113,100
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 27.31
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 10 months 24 days
Options Exercisable, Number (in shares) | shares	24,620
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 27.13
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 years
28.23 - 29.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 28.23
Exercise price range, upper range limit (in dollars per share)	$ 29.69
Options Outstanding, Number (in shares) | shares	120,050
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 28.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 6 months
Options Exercisable, Number (in shares) | shares	61,250
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 29.34
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years
31.80
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 31.8
Options Outstanding, Number (in shares) | shares	37,300
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years
Options Exercisable, Number (in shares) | shares	30,160
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 31.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years

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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 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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