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Derivative Instruments and Hedging Activities (Narrative) (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2013 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	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		$ 9,609,000		$ 28,172,000
Net (loss) gain on foreign currency transactions designated as hedges of net investments in foreign subsidiaries		925,000	$ (1,268,000)	$ 1,574,000	$ (2,011,000)
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI				12 months
Total Accumulated Other Comprehensive (Loss) Earnings [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Remaining unrecognzied losses associated with derivative instruments included in AOCI		$ 11,865,000		$ 11,865,000		$ 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
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]
Face amount | €								€ 40,000,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ 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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Date the debt instrument was issued, in CCYY-MM-DD format.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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