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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%