Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 261,965	$ 378,947	$ 307,362	$ 684,055
Other comprehensive income (loss):
Changes in unrealized gains on derivative cash flow hedges	0	0	4,028	0
Reclassification to earnings of realized gains on derivatives	(192)	(101)	(432)	(313)
Defined benefit plan adjustments	72	188	215	564
Other comprehensive income (loss)	(120)	87	3,811	251
Total comprehensive income	261,845	379,034	311,173	684,306
Less: Total comprehensive income attributable to noncontrolling interests	(888)	(1,213)	(1,081)	(1,889)
Total comprehensive income attributable to CFC	$ 260,957	$ 377,821	$ 310,092	$ 682,417