Derivative Instruments and Hedging Activities (Narrative) (Details)			1 Months Ended	3 Months Ended		9 Months Ended
	May 30, 2018 USD ($)	Apr. 18, 2018 USD ($)	Aug. 31, 2013 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 01, 2018 EUR (€)	May 31, 2018 USD ($) loan	Sep. 23, 2016 EUR (€)	Oct. 01, 2013 USD ($)	Jun. 30, 2013 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in accumulated OCI on derivative				$ (7,305,000)	$ (23,658,000)	$ 20,867,000	$ (23,658,000)
Net (loss) gain on foreign currency transactions designated as hedges of net investments in foreign subsidiaries				(598,000)	2,559,000	$ 976,000	548,000
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI						12 months
Derivative, cost of hedge					5,543,000		5,543,000
Total Accumulated Other Comprehensive (Loss) Earnings [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Remaining unrecognzied losses associated with derivative instruments included in AOCI				12,280,000		$ 12,280,000		$ 21,315,000
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, number of instruments | loan										5
Derivative, notional amount										$ 400,000,000
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										400,000,000
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										$ 167,420,000
Treasury Lock [Member] | Designated as Hedging Instrument [Member] | Derivatives in Cash Flow Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in accumulated OCI on derivative			$ 507,000
Net unrecognized gains on terminated derivative instruments expected to be reclassified to earnings						$ 72,000
Derivative, notional amount													$ 25,000,000
Foreign Exchange Option [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount | €									€ 490,000,000
Derivative, exchange rate	1.2432								1.2432
Derivative, currency bought						Euro
Derivative, cost of hedge	$ 5,543,000	$ 5,543,000
2013 Note Purchase Agreement [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face amount												$ 250,000,000
2016 Note Purchase Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Issuance date						Sep. 23, 2016
Face amount | €											€ 160,000,000
Series O Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face amount | €											43,000,000
Series N Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Face amount | €											77,000,000
Series M Notes [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				$ (598,000)	$ 2,559,000	$ 976,000	$ 548,000
Face amount | €											€ 40,000,000