Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 161,874	$ (90,332)
Other comprehensive income (loss):
Changes in unrealized gains on derivative cash flow hedges	0	416
Reclassification to earnings of realized gains on derivatives	(189)	(97)
Defined benefit plan adjustments	100	71
Other comprehensive income (loss)	(89)	390
Total comprehensive income (loss)	161,785	(89,942)
Less: Total comprehensive (income) loss attributable to noncontrolling interests	(193)	438
Total comprehensive income (loss) attributable to CFC	$ 161,592	$ (89,504)