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Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) Swap loan | Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) Swap loan | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | May 31, 2018 USD ($) loan | Sep. 23, 2016 EUR (€)
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | $ 33,750 |  | $ 33,750 |  |  |  |
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI | (42,620) |  | $ (42,620) |  | $ (21,132) |  |
2016 Note Purchase Agreements [Member] |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Issuance date |  |  | Sep. 23, 2016 |  |  |  |
Face amount | € |  |  |  |  |  |  | € 160,000,000
Series M Notes [Member] |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  | € 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 | 2,329 | $ 650 | $ 102 | $ (395) |  |  |
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 |
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 |  |  |  |
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] | 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 |

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