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Stock Award Plans - Other Stock Option Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation cost for stock options	$ 0	$ 0	$ 89
Weighted average grant date fair value per stock option (in dollars per share)	$ 3.15	$ 3.06	$ 2.73
Total intrinsic value of options exercised	$ 908	$ 2,605	$ 1,651
Grant date fair value of options exercised	285	1,328	1,422
Cash received from option exercises	$ 1,338	$ 7,238	$ 9,283

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercised, Grant Date Fair Value

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