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Stock Award Plans - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Shares
Outstanding, beginning balance (in shares)	122,530
Exercised (in shares)	(63,455)
Forfeited (in shares)	(8,015)
Outstanding, ending balance (in shares)	51,060	122,530
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 18.64
Exercised (in dollars per share)	21.07
Forfeited (in dollars per share)	21.02
Outstanding, ending balance (in dollars per share)	$ 15.25	$ 18.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable (in shares)	51,060
Options exercisable, weighted average exercise price (in dollars per share)	$ 15.25
Options outstanding, weighted average remaining contractual term (in years)	2 years	2 years
Options exercisable, weighted average remaining contractual term (in years)	2 years
Options outstanding, aggregate intrinsic value	$ 855	$ 1,839
Options exercisable, aggregate intrinsic value	$ 855

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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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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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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.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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

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

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

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