Summary of Stock Activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Mar. 31, 2016 USD ($) Years $ / shares shares	Sep. 30, 2015 USD ($) Years $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options outstanding | shares	268,460	305,750
Options granted | shares	21,540
Options exercised | shares	(58,830)
Options outstanding weighted average exercise price | $ / shares	$ 23.40	$ 21.90
Options outstanding weighted average exercise price - Granted | $ / shares	31.15
Options outstanding weighted average exercise price - Exercised | $ / shares	$ 18.42
Options outstanding weighted average remaining term | Years	6.1	5.9
Options outstanding weighted average grant date fair value | $	$ 2,572	$ 2,738
Options granted weighted average grant date fair value | $	272
Options exercised weighted average grant date fair value | $	$ (438)
Options exercisable at March 31, 2016 | shares	190,613
Options exerciseable weighted average exercise price | $ / shares	$ 22.19
Options exerciseable weighted average remaining term | Years	5.2
Options exerciseable weighted average grant date fair value | $	$ 1,653
Options vested during six months ended March 31, 2016 | shares	35,596
Options vested weighted average grant date fair value | $	$ 341