Derivative Financial Instruments Derivative Financial Instruments (Notional Amounts of Outstanding Forward Contracts (Details) - Foreign Exchange Forward [Member] - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Derivative [Line Items]
Derivative, Notional Amount	$ 249,534	$ 157,255
Canadian/U.S. Dollar
Derivative [Line Items]
Derivative, Notional Amount	14,685	17,448
Euro/U.S. Dollar
Derivative [Line Items]
Derivative, Notional Amount	174,120	82,917
British Pound/Euro
Derivative [Line Items]
Derivative, Notional Amount	1,382	9,409
Israeli Sheqel/U.S. Dollar
Derivative [Line Items]
Derivative, Notional Amount	7,271	4,607
Japanese Yen to Euro [Domain]
Derivative [Line Items]
Derivative, Notional Amount	32,782	25,133
Japanese Yen to USD [Domain]
Derivative [Line Items]
Derivative, Notional Amount	6,716	0
Swiss Franc/U.S. Dollar
Derivative [Line Items]
Derivative, Notional Amount	730	5,149
All other
Derivative [Line Items]
Derivative, Notional Amount	11,848	12,592
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	39,059	0
Designated as Hedging Instrument [Member] | Euro/U.S. Dollar
Derivative [Line Items]
Derivative, Notional Amount	26,181	0
Designated as Hedging Instrument [Member] | Japanese Yen/Euro
Derivative [Line Items]
Derivative, Notional Amount	8,800	0
Designated as Hedging Instrument [Member] | SEK / U.S. Dollar
Derivative [Line Items]
Derivative, Notional Amount	$ 4,078	$ 0