CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Cumulative effect from adoption of new accounting standard	Adjusted Balance	Noncontrolling interests	Noncontrolling interests Adjusted Balance	Total CFC equity	Total CFC equity Cumulative effect from adoption of new accounting standard	Total CFC equity Adjusted Balance	Accumulated other comprehensive income	Accumulated other comprehensive income Cumulative effect from adoption of new accounting standard	Accumulated other comprehensive income Adjusted Balance	CFC retained equity	CFC retained equity Cumulative effect from adoption of new accounting standard	CFC retained equity Adjusted Balance	Unallocated Net Income (Loss)	Unallocated Net Income (Loss) Cumulative effect from adoption of new accounting standard	Unallocated Net Income (Loss) Adjusted Balance	Members' capital reserve	Members' capital reserve Adjusted Balance	Patronage Capital Allocated	Patronage Capital Allocated Adjusted Balance	Membership Fees and Education Fund	Membership Fees and Education Fund Adjusted Balance
Beginning balance at May. 31, 2018	$ 1,505,853		$ 1,505,853	$ 31,520	$ 31,520	$ 1,474,333		$ 1,474,333	$ 8,544	$ (8,794)	$ (250)	$ 1,465,789	$ 8,794	$ 1,474,583	$ (36,434)	$ 8,794	$ (27,640)	$ 687,785	$ 687,785	$ 811,493	$ 811,493	$ 2,945	$ 2,945
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(151,210)			(1,979)		(149,231)						(149,231)			(318,135)			71,312		96,592		1,000
Other comprehensive income (loss)	103					103			103
Patronage capital retirement	(50,415)			(2,908)		(47,507)						(47,507)								(47,507)
Other	(449)			514		(963)						(963)										(963)
Ending balance at May. 31, 2019	1,303,882			27,147		1,276,735			(147)			1,276,882			(345,775)			759,097		860,578		2,982
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(589,430)			(4,190)		(585,240)						(585,240)			(730,773)			48,223		96,310		1,000
Other comprehensive income (loss)	(1,763)					(1,763)			(1,763)
Patronage capital retirement	(64,755)			(1,933)		(62,822)						(62,822)								(62,822)
Other	888			1,677		(789)						(789)										(789)
Ending balance at May. 31, 2020	648,822	$ (3,900)	$ 644,922	22,701	$ 22,701	626,121	$ (3,900)	$ 622,221	(1,910)		$ (1,910)	628,031	$ (3,900)	$ 624,131	(1,076,548)	$ (3,900)	$ (1,080,448)	807,320	$ 807,320	894,066	$ 894,066	3,193	$ 3,193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	813,978			2,311		811,667						811,667			618,577			102,429		89,761		900
Other comprehensive income (loss)	1,885					1,885			1,885
Patronage capital retirement	(61,911)			(2,054)		(59,857)						(59,857)								(59,857)
Other	1,005			1,973		(968)						(968)										(968)
Ending balance at May. 31, 2021	$ 1,399,879			$ 24,931		$ 1,374,948			$ (25)			$ 1,374,973			$ (461,871)			$ 909,749		$ 923,970		$ 3,125