Stock-based Compensation - Stock Options Outstanding (Details) - Stock options - $ / shares	9 Months Ended
Jun. 30, 2022
Shares
Outstanding at beginning of period (shares)	114,259
Granted (shares)	236
Exercised (shares)	(988)
Expired (shares)	(86,000)
Outstanding at end of period (shares)	27,507
Exercisable at end of period (shares)	27,271
Weighted Average Exercise Price
Outstanding at beginning of period (in USD per share)	$ 17.89
Granted (in USD per share)	16.58
Exercised (in USD per share)	11.32
Expired (in USD per share)	19.11
Outstanding at end of period (in USD per share)	14.31
Exercisable at end of period (in USD per share)	$ 14.29

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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