Restructuring and Other Charges (Schedule of restructuring charges reserve activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 2,415	$ 6,244	$ 36,608
Restructuring and other charges, net	51,100	(1,003)	7,942
Cash disbursements	(24,721)	(2,756)	(37,074)
Other non-cash charges	4,812		(704)
Foreign currency impact	(32)	(70)	(528)
Balance, end of period	31,086	2,415	6,244
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0	1,736	35,177
Restructuring and other charges, net	15,704	(509)	2,373
Cash disbursements	(15,402)	(1,247)	(35,069)
Other non-cash charges	0		0
Foreign currency impact	(4)	20	(745)
Balance, end of period	298	0	1,736
Facility Closures [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	2,415	4,508	1,431
Restructuring and other charges, net	32,908	(494)	5,569
Cash disbursements	(9,319)	(1,509)	(2,005)
Other non-cash charges	4,812		(704)
Foreign currency impact	(28)	(90)	217
Balance, end of period	30,788	$ 2,415	$ 4,508
2016 and 2019 Restructuring Plans [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges, net	$ 48,612