Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 163,217	$ 261,965	$ 514,855	$ 307,362
Other comprehensive income (loss):
Changes in unrealized gains on derivative cash flow hedges	6,691	0	6,691	4,028
Reclassification to earnings of realized gains on derivatives	(177)	(192)	(555)	(432)
Defined benefit plan adjustments	100	72	300	215
Other comprehensive income (loss)	6,614	(120)	6,436	3,811
Total comprehensive income	169,831	261,845	521,291	311,173
Less: Total comprehensive income attributable to noncontrolling interests	(321)	(888)	(541)	(1,081)
Total comprehensive income attributable to CFC	$ 169,510	$ 260,957	$ 520,750	$ 310,092