Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	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, 2014	Sep. 30, 2013	Sep. 30, 2012
Income before provision for income taxes
United States									$ (225,767)	$ 10,452	$ 76,096
Foreign									191,760	173,906	158,687
(Loss) income from continuing operations before income taxes	(177,856)	48,028	15,468	80,353	63,764	70,203	(18,050)	68,440	(34,007)	184,358	234,783
Federal
Current									10,668	6,831	32,287
Deferred									(43,708)	10,231	(15,315)
State
Current									3,495	2,727	5,261
Deferred									(5,689)	(4,106)	(2,275)
Foreign
Current									44,863	40,027	44,773
Deferred									516	(832)	533
Total provision									$ 10,145	$ 54,878	$ 65,264