Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010 Predecessor
Components of income from continuing operations before provision for income taxes
United States									$ 76,096	$ (80,927)	$ 237,306
Foreign									158,687	124,615	91,986
Income from continuing operations before income taxes	64,787	78,659	52,086	39,251	51,565	80,986	(2,777)	(86,086)	234,783	43,688	329,292
Federal
Current									32,287	3,712	86,896
Deferred									(15,315)	(29,177)	(13,160)
State
Current									5,261	3,637	12,459
Deferred									(2,275)	(3,490)	(1,045)
Foreign
Current									44,773	34,574	27,915
Deferred									533	1,733	1,205
Total provision									$ 65,264	$ 10,989	$ 114,270