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Long-Term Debt Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 12, 2018
May 31, 2019
May 31, 2018
May 31, 2017
Debt Instrument [Line Items]        
Gains (losses) on early extinguishment of debt   $ (7,100) $ 0 $ 192
Long-term Debt   $ 19,210,793 18,714,960  
Debt Instrument Fee Percentage   3.00%    
Maximum Percentage of Patronage Capital Distribution Allowed   5.00%    
Proceeds from issuance of subordinated debt   $ 250,000 0 $ 0
10.375 Percent Collateral Trust Bonds [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   10.375%    
Repayments of Secured Debt $ 300,000 $ 700,000    
Long-term Debt   $ 1,000,000    
3.90 Percent Collateral Trust Bonds [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   3.90%    
Proceeds from issuance of subordinated debt   $ 325,000    
4.40 Percent Collateral Trust Bonds [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   4.40%    
Proceeds from issuance of subordinated debt   $ 300,000    
3.70 Percent Collateral Trust Bonds [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   3.70%    
Proceeds from issuance of subordinated debt   $ 450,000    
4.30 Percent Collateral Trust Bonds [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   4.30%    
Proceeds from issuance of subordinated debt   $ 0    
Secured notes payable        
Debt Instrument [Line Items]        
Long-term Debt   $ 8,474,468 7,658,952  
Debt Instrument Fee Percentage   0.30%    
Guaranteed Underwriter Program Notes Payable        
Debt Instrument [Line Items]        
Long-term Debt   $ 5,410,507 4,856,143  
Additional Debt Instrument, Borrowing Capacity Available, Amount   750,000    
Debt Instrument, Unused Borrowing Capacity, Amount   1,350,000    
Long-term Debt   5,410,507 4,856,375  
Proceeds from issuance of subordinated debt   $ 625,000    
Guaranteed Underwriter Program Series M Notes Payable [Member]        
Debt Instrument [Line Items]        
Term of debt   20 years    
Federal Agricultural Mortgage Corporation        
Debt Instrument [Line Items]        
Debt Instrument Maximum Borrowing Capacity   $ 5,500,000    
Federal Agricultural Mortgage Corporation | First revolving note purchase agreement with FMAC        
Debt Instrument [Line Items]        
Long-term Debt   3,055,000 $ 2,791,000  
Debt Instrument Maximum Borrowing Capacity   5,200,000    
Proceeds from issuance of subordinated debt   575,000    
Federal Agricultural Mortgage Corporation | Second revolving note purchase agreement with FMAC        
Debt Instrument [Line Items]        
Debt Instrument Maximum Borrowing Capacity   $ 300,000