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Stock Award Plans - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Shares
Outstanding, beginning balance (in shares)	51,060
Exercised (in shares)	(22,975)
Forfeited (in shares)	(64,141)
Outstanding, ending balance (in shares)	320,287	51,060
Exercisable (in shares)	27,620
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 15.25
Exercised (in dollars per share)	12.99
Forfeited (in dollars per share)	27.96
Outstanding, ending balance (in dollars per share)	27.21	$ 15.25
Exercisable (in dollars per share)	$ 17.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, weighted average remaining contractual term (in years)	8 years	2 years
Options exercisable, weighted average remaining contractual term (in years)	1 year 4 months 24 days
Options outstanding, aggregate intrinsic value	$ 3,136	$ 855
Options exercisable, aggregate intrinsic value	$ 547
Stock Option Awards
Shares
Granted (in shares)	356,343	0	0
Weighted Average Exercise Price
Granted (in dollars per share)	$ 28.16

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

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

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