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Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | May 31, 2020 USD ($) Swap Loan | Sep. 23, 2016 EUR (€)
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Remaining unrecognized gains (losses) associated with derivative instruments included in AOCI | $ (11,838) |  | $ (11,838) |  | $ (9,701) |  |
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 | (978) | $ 807 | $ 888 | $ 4,432 |  |  |
2020 Fixed-Rate Cross-Currency Swaps [Member] |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | $ 400,000 |  | $ 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, number of instruments | Swap |  |  |  |  |  | 5 |
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] | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |
Derivative, number of instruments | Loan |  |  |  |  |  | 5 |

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