Derivative Instruments and Hedging Activities (Narrative) (Details) € in Thousands, ¥ in Thousands, $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2017 CNY (¥)	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 CNY (¥)
Net unrecognized gains on terminated derivative instruments expected to be reclassified to earnings				$ 72
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI				12 months
EUR Denominated Loan [Member]
Gain (loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary	$ (880)			$ (3,030)
Intercompany Loan [Member]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative					$ 1,484	$ 912
Gain (loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary	(283)		$ 395	452	912
Value of Net Investment Hedging Instruments Used | ¥							¥ 160,000			¥ 160,000
Derivatives in Cash Flow Hedging Relationships [Member]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative	$ 0	$ 0		$ 0	$ 0
Total Accumulated Other Comprehensive (Loss) Earnings [Member]
Unrecognized gains (loss)						$ 290			$ 236
2008 Note Purchase Agreement [Member]
Issuance Date				Oct. 01, 2008
2009 Note Purchase Agreement [Member]
Issuance Date				Apr. 01, 2009
2013 Note Purchase Agreement [Member]
Issuance Date				Oct. 01, 2013
Face Amount									$ 250,000
First Closing Notes [Member]
Issuance Date				Oct. 01, 2013
Second Closing Notes [Member]
Issuance Date				Nov. 15, 2013
2016 Note Purchase Agreements [Member]
Issuance Date				Sep. 23, 2016
Face Amount | €								€ 160,000
Series M Notes [Member]
Value of Net Investment Hedging Instruments Used | €								40,000
Face Amount | €								40,000
Series N Notes [Member]
Face Amount | €								77,000
Series O Notes [Member]
Face Amount | €								€ 43,000