Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Current
Federal	$ 60,420	$ 50,148	$ 54,931
State and foreign	8,802	2,728	2,172
Total	69,222	52,876	57,103
Deferred
Federal	3,337	13,408	(2,811)
State and foreign	(1,536)	268	(56)
Total	1,801	13,676	(2,867)
Total provision	$ 71,023	$ 66,552	$ 54,236