Derivative Financial Instruments (Notional Amounts Of Outstanding Forward Contracts) (Details) - Forward Contracts - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Designated as Hedging Instrument
Notional amounts	$ 90,937	$ 101,597
Designated as Hedging Instrument | Euro / U.S. Dollar
Notional amounts	55,744	64,831
Designated as Hedging Instrument | Japanese Yen / U.S. Dollar
Notional amounts	20,077	22,675
Designated as Hedging Instrument | Swedish Krona / U.S. Dollar
Notional amounts	15,116	14,091
Not Designated as Hedging Instrument
Notional amounts	401,511	318,519
Not Designated as Hedging Instrument | Canadian / U.S. Dollar
Notional amounts	7,500	12,809
Not Designated as Hedging Instrument | Swiss Franc / Euro
Notional amounts	0	7,157
Not Designated as Hedging Instrument | Switzerland, Francs
Notional amounts	13,135	605
Not Designated as Hedging Instrument | Chinese Yuan offshore / Euro
Notional amounts	0	10,423
Not Designated as Hedging Instrument | Euro / U.S. Dollar
Notional amounts	320,627	244,000
Not Designated as Hedging Instrument | Japanese Yen / Euro
Notional amounts	18,864	17,694
Not Designated as Hedging Instrument | Israeli Shekel / U.S. Dollar
Notional amounts	6,684	8,820
Not Designated as Hedging Instrument | Japanese Yen / U.S. Dollar
Notional amounts	5,611	3,198
Not Designated as Hedging Instrument | Swedish Krona / U.S. Dollar
Notional amounts	12,619	4,627
Not Designated as Hedging Instrument | Danish Krona / U.S. Dollar
Notional amounts	4,629	1,743
Not Designated as Hedging Instrument | Brazilian Real / U.S. Dollar
Notional amounts	3,117	0
Not Designated as Hedging Instrument | All other
Notional amounts	$ 8,725	$ 7,443