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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 |  |

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