6. Trading and Available-For-Sale Securities at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Trading securities	$ 167,949
Available-for-sale securities, at fair value	2
(Recast)
Trading securities		$ 212,595
Available-for-sale securities, at fair value		240
Equity securities
Trading securities	105,017	177,339
Available-for-sale securities, at fair value	2	240
Debt securities
Trading securities	62,691	34,986
Mutual investment funds
Trading securities	$ 241	$ 270