Supplemental Disclosure of Cash Flow Items (Details) - USD ($) $ in Thousands				12 Months Ended
	Dec. 11, 2015	Dec. 11, 2014	Dec. 11, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]
Cash paid for interest				$ 1,029	$ 966	$ 1,163
Cash paid for taxes				$ 9,764	$ 7,172	$ 8,966
Non-cash stock awards issued (in shares)				22,664	24,827	31,788
Fair value of non-cash stock awards granted	$ 556	$ 504	$ 775