CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Income Statement [Abstract]
Interest income	$ 1,351,729	$ 1,141,243	$ 1,116,601
Interest expense	(1,036,508)	(705,534)	(702,063)
Net interest income	315,221	435,709	414,538
Benefit (provision) for credit losses	(603)	17,972	(28,507)
Net interest income after benefit (provision) for credit losses	314,618	453,681	386,031
Non-interest income:
Fee and other income	18,134	17,193	18,929
Derivative gains	285,844	456,482	506,301
Investment securities losses	(4,974)	(30,179)	1,495
Total non-interest income	299,004	443,496	526,725
Non-interest expense:
Salaries and employee benefits	(59,011)	(51,863)	(55,258)
Other general and administrative expenses	(50,620)	(43,323)	(39,447)
Losses on early extinguishment of debt	(117)	(754)	(1,456)
Other non-interest expense	(1,487)	(1,552)	(1,619)
Total non-interest expense	(111,235)	(97,492)	(97,780)
Income before income taxes	502,387	799,685	814,976
Income tax provision	(800)	(1,148)	(998)
Net income	501,587	798,537	813,978
Less: Net income attributable to noncontrolling interests	(97)	(2,692)	(2,311)
Net income attributable to CFC	$ 501,490	$ 795,845	$ 811,667