Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative-effect adjustment from adoption of new accounting standard	Cumulative effect, period of adoption, adjusted balance	Membership Fees and Educational Fund	Membership Fees and Educational Fund Cumulative effect, period of adoption, adjusted balance	Patronage Capital Allocated	Patronage Capital Allocated Cumulative effect, period of adoption, adjusted balance	Members’ Capital Reserve	Members’ Capital Reserve Cumulative effect, period of adoption, adjusted balance	Unallocated Net Income (Loss)	Unallocated Net Income (Loss) Cumulative-effect adjustment from adoption of new accounting standard	Unallocated Net Income (Loss) Cumulative effect, period of adoption, adjusted balance	CFC Retained Equity	CFC Retained Equity Cumulative-effect adjustment from adoption of new accounting standard	CFC Retained Equity Cumulative effect, period of adoption, adjusted balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative effect, period of adoption, adjusted balance	Total CFC Equity	Total CFC Equity Cumulative-effect adjustment from adoption of new accounting standard	Total CFC Equity Cumulative effect, period of adoption, adjusted balance	Non-controlling Interests	Non-controlling Interests Cumulative effect, period of adoption, adjusted balance
Beginning balance at May. 31, 2020	$ 648,822	$ (3,900)	$ 644,922	$ 3,193	$ 3,193	$ 894,066	$ 894,066	$ 807,320	$ 807,320	$ (1,076,548)	$ (3,900)	$ (1,080,448)	$ 628,031	$ (3,900)	$ 624,131	$ (1,910)	$ (1,910)	$ 626,121	$ (3,900)	$ 622,221	$ 22,701	$ 22,701
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	684,055									682,166			682,166					682,166			1,889
Other comprehensive loss	251															251		251
Patronage capital retirement	(61,911)					(59,857)							(59,857)					(59,857)			(2,054)
Other	1,272			(714)									(714)					(714)			1,986
Ending balance at Feb. 28, 2021	1,268,589			2,479		834,209		807,320		(398,282)			1,245,726			(1,659)		1,244,067			24,522
Beginning balance at Nov. 30, 2020	891,719			2,551		834,209		807,320		(776,016)			868,064			(1,746)		866,318			25,401
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	378,947									377,734			377,734					377,734			1,213
Other comprehensive loss	87															87		87
Patronage capital retirement	(2,054)																				(2,054)
Other	(110)			(72)									(72)					(72)			(38)
Ending balance at Feb. 28, 2021	1,268,589			2,479		834,209		807,320		(398,282)			1,245,726			(1,659)		1,244,067			24,522
Beginning balance at May. 31, 2021	1,399,879			3,125		923,970		909,749		(461,871)			1,374,973			(25)		1,374,948			24,931
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	307,362									306,281			306,281					306,281			1,081
Other comprehensive loss	3,811															3,811		3,811
Patronage capital retirement	(59,979)					(57,565)							(57,565)					(57,565)			(2,414)
Other	1,522			(694)									(694)					(694)			2,216
Ending balance at Feb. 28, 2022	1,652,595			2,431		866,405		909,749		(155,590)			1,622,995			3,786		1,626,781			25,814
Beginning balance at Nov. 30, 2021	1,390,985			2,665		866,405		909,749		(416,667)			1,362,152			3,906		1,366,058			24,927
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	261,965									261,077			261,077					261,077			888
Other comprehensive loss	(120)															(120)		(120)
Patronage capital retirement	0																				0
Other	(235)			(234)									(234)					(234)			(1)
Ending balance at Feb. 28, 2022	$ 1,652,595			$ 2,431		$ 866,405		$ 909,749		$ (155,590)			$ 1,622,995			$ 3,786		$ 1,626,781			$ 25,814