Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Income Statement [Abstract]
Interest income	$ 306,978	$ 283,268
Interest expense	(209,468)	(174,777)
Net interest income	97,510	108,491
Provision for credit losses	(3,496)	(4,003)
Net interest income after provision for credit losses	94,014	104,488
Non-interest income:
Fee and other income	4,056	3,941
Derivative gains (losses)	93,587	(172,163)
Investment securities losses	(3,679)	(2,225)
Total non-interest income	93,964	(170,447)
Non-interest expense:
Salaries and employee benefits	(13,778)	(13,310)
Other general and administrative expenses	(11,741)	(10,900)
Other non-interest expense	(322)	(256)
Total non-interest expense	(25,841)	(24,466)
Income (loss) before income taxes	162,137	(90,425)
Income tax benefit (provision)	(263)	93
Net income (loss)	161,874	(90,332)
Less: Net (income) loss attributable to noncontrolling interests	(193)	438
Net income (loss) attributable to CFC	$ 161,681	$ (89,894)