Restructuring Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 15,254	$ 26,370	$ 19,529
Restructuring charges	76,273	43,409	28,406
Cash disbursements	(55,019)	(53,588)	(20,575)
Foreign currency impact	100	(937)	(990)
Balance, end of period	36,608	15,254	26,370
Employee Severance And Related Benefits
Restructuring Reserve [Roll Forward]
Balance, beginning of period	14,086	25,835	19,234
Restructuring charges	74,929	41,997	27,918
Cash disbursements	(53,966)	(52,882)	(20,334)
Foreign currency impact	128	(864)	(983)
Balance, end of period	35,177	14,086	25,835
Facility Closures and Other Costs
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1,168	535	295
Restructuring charges	1,344	1,412	488
Cash disbursements	(1,053)	(706)	(241)
Foreign currency impact	(28)	(73)	(7)
Balance, end of period	$ 1,431	$ 1,168	$ 535