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Summary of Significant Accounting Policies - Hedging Activities (Details) $ in Thousands, € in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) $ / € | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) $ / € | Jun. 30, 2021 USD ($) | Jun. 30, 2022 EUR (€) $ / € | Feb. 01, 2022 USD ($) | Feb. 01, 2022 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |
Interest income | $ 6,822 | $ 409 | $ 9,933 | $ 503 |  |  |
Currency Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, notional amount, cross-currency swap, exchanged |  |  |  |  |  | $ 1,030,000 |
Derivative, notional amount, cross-currency swap, received | € |  |  |  |  |  |  | € 915
Derivative, notional amount | $ 960,000 |  | $ 960,000 |  |  |  |
Derivative, fixed interest rate (as a percent) | 1.283% |  | 1.283% |  | 1.283% |  |
Derivative, notional amount, cross-currency swap, maturity, deliver | € |  |  |  |  | € 852 |  |
Derivative, notional amount, cross-currency swap, maturity, receive | $ 960,000 |  | $ 960,000 |  |  |  |
Derivative, forward exchange rate | $ / € | 1.1261 |  | 1.1261 |  | 1.1261 |  |
Gain to accumulated other comprehensive income | $ 55,100 |  | $ 65,800 |  |  |  |
Interest income | $ 3,100 |  | $ 5,100 |  |  |  |
Currency Swap [Member] | Designated as Hedging Instrument [Member] | Weighted Average [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, variable interest rate |  |  |  |  |  | 1.196% | 1.196%

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