Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Current:
Federal	$ 23,923	$ 48,327	$ 29,438
State	3,108	5,752	4,760
Foreign	18,343	16,594	10,612
Deferred:
Federal	19,236	(4,378)	13,904
State	751	(2,966)	885
Foreign	(5,864)	(1,929)	(5,970)
Income tax expense	$ 59,497	$ 61,400	$ 53,629