SEGMENT DATA - Net Revenues by Geographical Area (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Net revenues (Note 10)	$ 4,966,370	$ 5,164,310	$ 5,701,879
Operating Segments
Segment Reporting Information [Line Items]
Net revenues (Note 10)	4,993,255	5,163,066	5,689,582
Corporate Other
Segment Reporting Information [Line Items]
Net revenues (Note 10)	(26,885)	1,244	12,297
UNITED STATES \| Operating Segments
Segment Reporting Information [Line Items]
Net revenues (Note 10)	2,570,647	2,817,170	3,172,245
Other countries \| Operating Segments
Segment Reporting Information [Line Items]
Net revenues (Note 10)	$ 2,422,608	$ 2,345,896	$ 2,517,337

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details