Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Current tax provision:
U.S. Federal	$ 27,611	$ 28,124	$ 13,019
State	5,035	5,129	2,374
Foreign	1,757	118
Current income tax expense	34,403	33,371	15,393
Deferred tax (benefit) expense:
U.S. Federal	(6,012)	(1,454)	(194)
State	(1,096)	(265)	260
Foreign	256
Total deferred tax benefit (expense)	(6,852)	(1,719)	66
Total provision	$ 27,551	$ 31,652	$ 15,459