Restructuring Charges (Schedule of restructuring charges reserve activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 6,244	$ 36,608	$ 15,254
Restructuring and other charges, net	(1,003)	7,942	76,273
Cash disbursements	(2,756)	(37,074)	(55,019)
Other non-cash charges		(704)
Foreign currency impact	(70)	(528)	100
Balance, end of period	2,415	6,244	36,608
Employee Severance And Related Benefits
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1,736	35,177	14,086
Restructuring and other charges, net	(509)	2,373	74,929
Cash disbursements	(1,247)	(35,069)	(53,966)
Other non-cash charges		0
Foreign currency impact	20	(745)	128
Balance, end of period	0	1,736	35,177
Facility Closures and Other Costs
Restructuring Reserve [Roll Forward]
Balance, beginning of period	4,508	1,431	1,168
Restructuring and other charges, net	(494)	5,569	1,344
Cash disbursements	(1,509)	(2,005)	(1,053)
Other non-cash charges		(704)
Foreign currency impact	(90)	217	(28)
Balance, end of period	$ 2,415	$ 4,508	$ 1,431