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Derivative Instruments and Hedging Activities (Narrative) (Details) € in Thousands, ¥ in Thousands, $ in Thousands		3 Months Ended				9 Months Ended
	Apr. 18, 2018 EUR (€)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 EUR (€)	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 CNY (¥)	Jun. 30, 2013 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative		$ (23,658)				$ (23,658)
Unrealized Gain (Loss) on Derivatives Arising During Period		(23,658)				$ (23,658)
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				$ 5,543
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				$ 283
Second China Intercompany Loan [Member]
Derivative Instruments, Gain (Loss) [Line Items]
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		$ (2,559)	$ (880)			(548)	$ 3,030
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | 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			$ 283				$ 452
Total Accumulated Other Comprehensive (Loss) Earnings [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI									$ (18,521)	$ 218
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] | 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
Net unrecognized gains on terminated derivative instruments expected to be reclassified to earnings						$ 72
Derivative, Notional Amount												$ 25,000
Derivative, Notional Amount												$ 25,000
Series D Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance Date						Oct. 01, 2008
Series F Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance Date						Apr. 01, 2009
2013 Note Purchase Agreement [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance Date						Oct. 01, 2013
Face Amount									$ 250,000
First Closing Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance Date						Oct. 01, 2013
Second Closing Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance Date						Nov. 15, 2013
2016 Note Purchase Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance Date						Sep. 23, 2016
Face Amount | €								160,000
Series M Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face Amount | €								40,000
Series N Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face Amount | €								77,000
Series O Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face Amount | €								€ 43,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 30
-Section 55
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