Derivative Financial Instruments (Counterparty Credit Quality with Respect to Fair Value of OTC Derivatives Assets) (Details) $ in Thousands |
May 31, 2022
USD ($)
|
|---|---|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | |
| A- or higher | $ 371,914 |
| BBB- to BBB+ | 36,799 |
| BB+ or lower | 73,680 |
| Unrated | 91,311 |
| Total OTC derivative assets included in Financial instruments owned, at fair value | $ 573,704 |