Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Taxes
Effective income tax rate (as a percent)	28.60%	30.70%	32.80%	32.60%
Accrued interest	$ 679		$ 679
Accrued penalties	$ 174		$ 174