Investment Securities - Schedule of Investment Debt Securities Portfolio and Fair Value (Details) - USD ($) $ in Thousands	Aug. 31, 2026	May 31, 2026
Debt and Equity Securities, FV-NI [Line Items]
Debt securities trading, at fair value	$ 27,667	$ 31,144
Corporate debt securities
Debt and Equity Securities, FV-NI [Line Items]
Debt securities trading, at fair value	27,322	30,765
Commercial agency mortgage-backed securities (“MBS”)
Debt and Equity Securities, FV-NI [Line Items]
Debt securities trading, at fair value	$ 345	$ 379

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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+ Details