Variable Interest Entities - Schedule of Variable Interest Entities, Credit Commitments (Details) - USD ($) $ in Thousands	Feb. 28, 2026	May 31, 2025
Variable Interest Entity [Line Items]
CFC third-party guarantees	$ 1,145,727	$ 1,210,606
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total CFC credit commitments	5,000,000	5,000,000
Borrowings payable to CFC	1,767,923	1,640,372
CFC third-party guarantees	107,345	60,564
Other credit enhancements	1,402	1,275
Total credit enhancements	108,747	61,839
Total outstanding commitments	1,876,670	1,702,211
CFC credit commitments available	$ 3,123,330	$ 3,297,789