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Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 23, 2016 EUR (€)	May 31, 2020 USD ($)	Jun. 30, 2020 USD ($) Swap loan	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Swap loan	Jun. 30, 2019 USD ($)	Jun. 30, 2020 EUR (€) Swap loan	Sep. 30, 2019 USD ($)	May 31, 2018 USD ($) loan
Derivative Instruments Gain Loss [Line Items]
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings			$ 22,649	$ (6,890)	$ 18,255	$ 11,831
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI			(15,230)		$ (15,230)			$ (5,004)
2016 Note Purchase Agreements [Member]
Derivative Instruments Gain Loss [Line Items]
Issuance date	Sep. 23, 2016				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			792	598	$ 1,187	976
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			(2,254)	(1,664)	(3,291)	3,471
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 | 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
Floating-Rate Cross-Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount		108,823
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
Fixed-Rate Cross-Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount		400,000
2020 Fixed-Rate Cross-Currency Swaps [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount			$ 400,000		$ 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		5
2020 Floating-Rate Cross-Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount			$ 45,000		$ 45,000
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Selling, General and Administrative Expense [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings			$ 24,885	$ (5,244)	$ 21,492	$ 8,306
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative, notional amount									$ 400,000
Derivative, number of instruments | loan			5		5		5		5
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings		$ (32,200)

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