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Derivative Instruments and Hedging Activities (Narrative) (Details) € in Thousands, ¥ in Thousands, $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended			15 Months Ended	18 Months Ended
	Apr. 18, 2018 EUR (€)	Sep. 30, 2013 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2018 EUR (€)	Sep. 30, 2018 USD ($)	Sep. 30, 2016 CNY (¥)	Jun. 30, 2016 CNY (¥)	Jun. 30, 2013 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative				$ (23,000)
Unrealized Gain (Loss) on Derivatives Arising During Period				$ (23,000)
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI				12 months
Face Amount | €									€ 160,000
Derivative, Currency Bought	Euro
Derivative, Cost of Hedge				$ 5,543	$ 0	$ 0
First China Intercompany Loan [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary						912		$ 1,484
Value of Net Investment Hedging Instruments Used | ¥												¥ 160,000
Second China Intercompany Loan [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary					453	(73)	$ 380
Value of Net Investment Hedging Instruments Used | ¥											¥ 160,000
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | EUR Denominated Loan [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary				838	(2,395)	$ (47)
Total Accumulated Other Comprehensive (Loss) Earnings [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI					$ 218		$ 218			$ (21,315)
Floating-Rate Cross Currency Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative				(1,034)
Unrealized Gain (Loss) on Derivatives Arising During Period				(1,034)
Floating-Rate Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount			$ 167,420
Derivative, Notional Amount			167,420
Fixed-Rate Cross Currency Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative				(21,966)
Unrealized Gain (Loss) on Derivatives Arising During Period				$ (21,966)
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Derivatives in Cash Flow Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount			400,000
Derivative, Notional Amount			400,000
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount			400,000
Derivative, Notional Amount			400,000
Foreign Exchange Option [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount | €	€ 490,000
Derivative, Notional Amount | €	€ 490,000
Derivative, Forward Exchange Rate	1.2432
Derivative, Cost of Hedge			$ 5,543
Derivative, Inception Date				Apr. 18, 2018
Derivative, Maturity Date				Jun. 01, 2018
Derivative, Exercise Date				May 30, 2018
Treasury Lock [Member] | Designated as Hedging Instrument [Member] | Derivatives in Cash Flow Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative		$ 507
Unrealized Gain (Loss) on Derivatives Arising During Period		$ 507
Net unrecognized gains on terminated derivative instruments expected to be reclassified to earnings				$ 72
Derivative, Notional Amount													$ 25,000
Derivative, Notional Amount													$ 25,000
2016 Note Purchase Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance Date				Sep. 23, 2016
Series M Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face Amount | €									€ 40,000

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