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Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	May 31, 2020 USD ($)	Aug. 31, 2013 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) Swap loan	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2020 EUR (€) Swap loan	May 31, 2018 USD ($) loan	Sep. 23, 2016 EUR (€)	Jun. 30, 2013 USD ($)
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount				$ 41,250
Swap termination fee			$ 3,000
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings				(2,134)	$ 31,446	$ (1,467)
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI				$ (21,132)	(5,004)
2016 Note Purchase Agreements [Member]
Derivative Instruments Gain Loss [Line Items]
Issuance date				Sep. 23, 2016
Face amount | €							€ 160,000,000		€ 160,000,000
Series M Notes [Member]
Derivative Instruments Gain Loss [Line Items]
Face amount | €							€ 40,000,000		€ 40,000,000
Maturity date				Sep. 23, 2026
Gain (Loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary				$ 3,199	2,682	838
Floating-Rate Cross Currency Interest Rate Contract [Member] | Selling, General and Administrative Expense [Member] | Derivatives in Fair Value Hedging Relationships [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings				(5,396)	8,356	(472)
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
Floating-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Derivatives in Fair Value Hedging Relationships [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	$ 1,719
2020 Fixed-Rate Cross-Currency Swaps [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount				$ 400,000
2020 Fixed-Rate Cross-Currency Swaps [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount								400,000
Derivative, number of instruments | Swap				5			5
Floating-Rate Cross-Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	108,823
Fixed-Rate Cross-Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount	400,000
Floating-Rate Cross-Currency Swap and Fixed-Rate Cross-Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Proceeds from swap contracts settlement	59,571
Derivative asset, fair value	58,191
Proceed from net interest accrued on swap contracts settlement	4,380
Floating-Rate Cross-Currency Swap and Fixed-Rate Cross-Currency Swap [Member] | Selling, General and Administrative Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Swap termination fee	3,000
2020 Floating-Rate Cross-Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount				$ 45,000
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Selling, General and Administrative Expense [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings				$ 3,190	$ 23,018	$ (1,067)
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount								$ 400,000
Derivative, number of instruments | loan				5			5	5
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings	$ 32,200
Treasury Lock [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount										$ 25,000
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings		$ 507

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