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Stock Compensation Plans: Stock Option Activity (Details) - $ / shares | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Number of Shares |  |  |
Options outstanding, beginning of period (in shares) | 406,815 | 395,349 | 378,304
Options granted (in shares) | 74,000 | 81,000 | 69,150
Options exercised (in shares) | (36,720) | (64,264) | (37,975)
Options forfeited (in shares) | (22,170) | (5,270) | (14,130)
Options outstanding, end of period (in shares) | 421,925 | 406,815 | 395,349
Weighted Average Exercise Price |  |  |
Options outstanding, beginning of period (in dollars per share) | $ 21.62 | $ 18.45 | $ 18.15
Options granted (in dollars per share) | 27.40 | 28.06 | 17.01
Options exercised (in dollars per share) | 11.31 | 9.81 | 10.31
Options forfeited (in dollars per share) | 26.01 | 26.91 | 25.36
Options outstanding, end of period (in dollars per share) | $ 23.30 | $ 21.62 | $ 18.45

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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