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Summary of Significant Accounting Policies - Hedging Activities (Details)
$ in Thousands, € in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
USD ($)
$ / €
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
$ / €
Mar. 31, 2021
USD ($)
Mar. 31, 2022
EUR (€)
$ / €
Derivative [Line Items]          
Interest income $ 3,076 $ 18 $ 3,111 $ 94  
Currency Swap [Member] | Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Derivative, notional amount, cross-currency swap, exchanged 1,030,000   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 $ 10,700   $ 10,700    
Interest income $ 2,100   $ 2,100    
Currency Swap [Member] | Designated as Hedging Instrument [Member] | Weighted Average [Member]          
Derivative [Line Items]          
Derivative, variable interest rate 1.196%   1.196%   1.196%