Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands		2 Months Ended	12 Months Ended
	Jan. 29, 2026	Jul. 31, 2026	May 31, 2026	May 31, 2025
Debt Instrument [Line Items]
Long-term debt			$ 28,345,934	$ 27,163,701
Term in Years				30 years
Federal Agricultural Mortgage Corporation
Debt Instrument [Line Items]
Debt Instrument maximum borrowing capacity			$ 6,500,000
Debt instrument, renewal periods			1 year
Debt instrument, termination written notice, term			60 days
Proceeds from issuance of secured debt			$ 250,000
Total secured long-term debt
Debt Instrument [Line Items]
Long-term debt			15,753,118	$ 17,133,015
Collateral trust bonds
Debt Instrument [Line Items]
Long-term debt			6,502,403	6,895,702
Guaranteed Underwriter Program notes payable
Debt Instrument [Line Items]
Unused borrowing capacity, amount			$ 1,800,000
Maximum percentage of patronage capital distribution allowed			5.00%
Total unsecured long-term debt
Debt Instrument [Line Items]
Long-term debt			$ 12,592,816	$ 10,030,686
Medium-term notes
Debt Instrument [Line Items]
Repayments of long-term debt			1,239,000
Medium-term notes | Retail Investors
Debt Instrument [Line Items]
Total aggregate principal amount			18,000
5.00 percent collateral trust bonds | Collateral trust bonds
Debt Instrument [Line Items]
Repayments of secured debt			413,000
Committed loan facility | Guaranteed Underwriter Program notes payable
Debt Instrument [Line Items]
Repayments of secured debt			1,118,000
Committed loan facility, Series U | Guaranteed Underwriter Program notes payable
Debt Instrument [Line Items]
Debt Instrument maximum borrowing capacity	$ 450,000
Committed loan facility, Series U | Guaranteed Underwriter Program notes payable | Maximum
Debt Instrument [Line Items]
Term in Years	30 years
Farmer Mac notes payable | Federal Agricultural Mortgage Corporation
Debt Instrument [Line Items]
Long-term debt			3,912,000
Repayments of secured debt			118,000
Unused borrowing capacity, amount			$ 2,588,000
Medium-term notes with fixed rate | Medium-term notes
Debt Instrument [Line Items]
Term in Years			3 years
Total aggregate principal amount			$ 4,425,000
Proceeds from issuance of unsecured debt			$ 2,800,000
Average fixed interest rate			4.14%
Repayments of unsecured debt			$ 600,000
Medium-term notes with fixed rate | Medium-term notes | Subsequent event
Debt Instrument [Line Items]
Term in Years		18 months
Proceeds from issuance of unsecured debt		$ 300,000
Medium-term notes at a floating interest rate | Medium-term notes
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt			$ 1,625,000
Medium-term notes with floating rate | Medium-term notes
Debt Instrument [Line Items]
Term in Years			16 months
Debt | Credit availability concentration risk | Total secured long-term debt
Debt Instrument [Line Items]
Concentration risk, percentage			56.00%	63.00%
Debt | Credit availability concentration risk | Total unsecured long-term debt
Debt Instrument [Line Items]
Concentration risk, percentage			44.00%	37.00%
Debt | Credit availability concentration risk | Long-term debt
Debt Instrument [Line Items]
Concentration risk, percentage			79.00%	78.00%
Long-term debt | Credit availability concentration risk | Fixed rate debt
Debt Instrument [Line Items]
Concentration risk, percentage			90.00%	94.00%
Long-term debt | Credit availability concentration risk | Variable rate debt
Debt Instrument [Line Items]
Concentration risk, percentage			10.00%	6.00%