Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended											12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Current:
Federal												$ 21,928	$ 39,641	$ 58,736
State and foreign												(10,498)	1,490	7,667
Total												11,430	41,131	66,403
Deferred:
Federal												(1,220)	(17,689)	1,894
State and foreign												(4,954)	2,756	(632)
Total												(6,174)	(14,933)	1,262
Total income tax expense	$ (825)	$ 406	$ 852	$ 4,823	$ (11,196)	$ 7,362	$ 15,765	$ 14,267	$ 16,190	$ 13,677	$ 17,713	$ 5,256	$ 26,198	$ 67,665