Equity - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2025	May 31, 2025	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025	Nov. 30, 2025	Nov. 30, 2024	May 31, 2024
Stockholder's Equity [Line Items]
Equity		$ 3,103,466	$ 3,096,729	$ 3,031,186	$ 3,096,729	$ 3,031,186	$ 3,074,044	$ 2,945,168	$ 3,012,169
Patronage capital retirement					52,978	46,846
Net income			22,737	86,136	46,977	66,613
Cash Flow Hedging
Stockholder's Equity [Line Items]
Expected reclassification from AOCI over 12 months					1,000
Total CFC Equity
Stockholder's Equity [Line Items]
Equity		3,082,477	3,075,515	3,010,449	3,075,515	3,010,449	3,053,180	2,924,581	2,991,462
Patronage capital retirement					52,978	46,846
Net income			22,388	85,986	46,751	66,585
Membership Fees and Educational Fund
Stockholder's Equity [Line Items]
Equity		3,624	2,884	2,772	2,884	2,772	2,939	2,868	3,576
Membership Fees and Educational Fund | CFC
Stockholder's Equity [Line Items]
Net income		1,000
Patronage Capital Allocated
Stockholder's Equity [Line Items]
Equity		948,526	894,736	881,386	894,736	881,386	895,548	881,386	928,232
Patronage capital retirement					52,978	46,846
Patronage Capital Allocated | CFC
Stockholder's Equity [Line Items]
Net income	$ 67,000
Members’ Capital Reserve
Stockholder's Equity [Line Items]
Equity		$ 1,631,609	$ 1,632,421	$ 1,455,564	$ 1,632,421	$ 1,455,564	$ 1,631,609	$ 1,455,564	$ 1,455,564
Members’ Capital Reserve | CFC
Stockholder's Equity [Line Items]
Net income	176,000
Retained Earnings, Appropriated Patronage Capital Allocated And Retired | CFC
Stockholder's Equity [Line Items]
Net income	53,000
Patronage refunds	53,000
Retained Earnings Allocation Of 50% Of Prior Year Patronage Capital Allocation | CFC
Stockholder's Equity [Line Items]
Net income	$ 34,000
Percentage of patronage capital allocation	50.00%
Retained Earnings Allocation Held For Twenty Five Years | CFC
Stockholder's Equity [Line Items]
Net income	$ 19,000
Period for which prior years allocated patronage capital is required to be held	25 years