Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Income Statement [Abstract]
Interest income	$ 353,292	$ 285,206	$ 984,464	$ 851,626
Interest expense	(281,709)	(173,654)	(736,621)	(522,027)
Net interest income	71,583	111,552	247,843	329,599
Benefit (provision) for credit losses	11,318	12,749	(3,806)	12,146
Net interest income after benefit (provision) for credit losses	82,901	124,301	244,037	341,745
Non-interest income:
Fee and other income	5,326	4,270	13,548	13,042
Derivative gains	102,308	169,280	342,685	43,203
Investment securities losses	(1,402)	(11,621)	(5,574)	(18,190)
Total non-interest income	106,232	161,929	350,659	38,055
Non-interest expense:
Salaries and employee benefits	(14,808)	(13,181)	(42,792)	(38,871)
Other general and administrative expenses	(10,507)	(9,898)	(35,289)	(31,513)
Other non-interest expense	(298)	(843)	(975)	(1,530)
Total non-interest expense	(25,613)	(23,922)	(79,056)	(71,914)
Income before income taxes	163,520	262,308	515,640	307,886
Income tax provision	(303)	(343)	(785)	(524)
Net income	163,217	261,965	514,855	307,362
Less: Net income attributable to noncontrolling interests	(321)	(888)	(541)	(1,081)
Net income attributable to CFC	$ 162,896	$ 261,077	$ 514,314	$ 306,281