CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2025	Nov. 30, 2024	Nov. 30, 2025	Nov. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 19,558	$ 144,803	$ 24,240	$ (19,523)
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)	(754)	(235)	(921)
Defined benefit plan adjustments	119	96	238	192
Other comprehensive income (loss)	2	(658)	3	74
Total comprehensive income (loss)	19,560	144,145	24,243	(19,449)
Less: Total comprehensive (income) loss attributable to non-controlling interests	39	(360)	123	122
Total comprehensive income (loss) attributable to CFC	$ 19,599	$ 143,785	$ 24,366	$ (19,327)