Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Taxes
Effective income tax rate (as a percent)	30.70%	27.00%	32.60%	28.70%
Accrued interest	$ 1,904		$ 1,904
Accrued penalties	662		662
Liability of unrecognized tax benefits	14,260		14,260
Unrecognized tax benefits, recognition of which would have an effect on provision for income taxes and effective income tax rate	$ 10,670		$ 10,670