CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 22,737	$ 86,136	$ 46,977	$ 66,613
Other comprehensive income (loss):
Changes in unrealized gains on derivative cash flow hedges	0	0	0	803
Reclassification to earnings of realized gains on derivatives	(117)	(117)	(352)	(1,038)
Defined benefit plan adjustments	119	95	357	287
Other comprehensive income (loss)	2	(22)	5	52
Total comprehensive income	22,739	86,114	46,982	66,665
Less: Total comprehensive income attributable to non-controlling interests	(349)	(150)	(226)	(28)
Total comprehensive income attributable to CFC	$ 22,390	$ 85,964	$ 46,756	$ 66,637