Derivative Financial Instruments - Schedule of Notional Amounts of Outstanding Forward Contracts (Details) - Forward Contracts - USD ($) $ in Thousands |
Jun. 30, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Designated as Hedging Instrument | Net Investment Hedging | ||
| Derivative [Line Items] | ||
| Notional amount | $ 527,036 | $ 490,458 |
| Euro / U.S. Dollar | ||
| Derivative [Line Items] | ||
| Notional amount | 687,200 | 835,400 |
| Euro / U.S. Dollar | Designated as Hedging Instrument | Net Investment Hedging | ||
| Derivative [Line Items] | ||
| Notional amount | 508,428 | 480,198 |
| Japanese Yen / U.S. Dollar | ||
| Derivative [Line Items] | ||
| Notional amount | 1,400 | 41,900 |
| Japanese Yen / U.S. Dollar | Designated as Hedging Instrument | Net Investment Hedging | ||
| Derivative [Line Items] | ||
| Notional amount | $ 18,608 | $ 10,260 |