Quarterly report pursuant to Section 13 or 15(d)

TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE (Details)

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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE (Details) - USD ($)
Sep. 30, 2021
Mar. 31, 2021
Trading securities $ 974,481,000 $ 736,188,000
Total Available-for-sale securities, at fair value 1,000 1,000
Level 1    
Trading securities 921,474,000 717,118,000
Total Available-for-sale securities, at fair value 0 0
Level 2    
Trading securities 50,291,000 1,000
Total Available-for-sale securities, at fair value 0 0
Level 3    
Trading securities 2,716,000 19,069,000
Total Available-for-sale securities, at fair value 1,000 1,000
Corporate equity    
Trading securities 70,377,000 47,340,000
Corporate equity | Level 1    
Trading securities 19,710,000 28,630,000
Corporate equity | Level 2    
Trading securities 50,291,000 1,000
Corporate equity | Level 3    
Trading securities 376,000 18,709,000
Non-U.S. sovereign debt    
Trading securities 261,442,000 333,619,000
Non-U.S. sovereign debt | Level 1    
Trading securities 259,480,000 333,619,000
Non-U.S. sovereign debt | Level 2    
Trading securities 0 0
Non-U.S. sovereign debt | Level 3    
Trading securities 1,962 0
Total Available-for-sale securities, at fair value 0  
Corporate debt [Member]    
Trading securities 618,428,000 334,763,000
U.S. sovereign debt    
Trading securities 7,206,000 10,828,000
U.S. sovereign debt | Level 1    
Trading securities 7,206,000 10,828,000
U.S. sovereign debt | Level 2    
Trading securities 0 0
U.S. sovereign debt | Level 3    
Trading securities 0 0
Exchange traded notes    
Trading securities 17,028,000 9,638,000
Exchange traded notes | Level 1    
Trading securities 17,028,000 9,638,000
Exchange traded notes | Level 2    
Trading securities 0 0
Exchange traded notes | Level 3    
Trading securities 0 0
Preferred Shares    
Total Available-for-sale securities, at fair value 0 1,000
Equity securities    
Total Available-for-sale securities, at fair value 1,000 1,000
Total Available-for-sale securities, at fair values $ 1 $ 1