v3.26.3
Loans - Schedule of Pledged Collateral Loans (Details) - USD ($)
$ in Thousands
Aug. 31, 2026
May 31, 2026
Collateral Trust Bonds 2007 Indenture    
Pledging of Loans and Loans on Deposit    
Notes payable outstanding $ 6,661,283 $ 6,665,191
Loans outstanding and pledged as collateral 7,420,627 7,692,299
Collateral Trust Bonds 1994 Indenture    
Pledging of Loans and Loans on Deposit    
Notes payable outstanding 5,000 5,000
Notes Payable | Federal Financing Bank    
Pledging of Loans and Loans on Deposit    
Notes payable outstanding 5,284,047 5,338,722
Notes Payable | Farmer Mac:    
Pledging of Loans and Loans on Deposit    
Notes payable outstanding 3,866,451 3,911,993
Mortgage notes | Distribution system mortgage notes pledged | Collateral Trust Bonds 2007 Indenture    
Pledging of Loans and Loans on Deposit    
Loans outstanding and pledged as collateral 7,328,520 7,597,147
Mortgage notes | Distribution system mortgage notes pledged | Collateral Trust Bonds 1994 Indenture    
Pledging of Loans and Loans on Deposit    
Loans outstanding and pledged as collateral 6,741 7,155
Mortgage notes | Distribution and power supply system mortgage notes pledged | Federal Financing Bank    
Pledging of Loans and Loans on Deposit    
Loans outstanding and pledged as collateral 6,641,297 6,744,950
Mortgage notes | Distribution and power supply system mortgage notes pledged | Farmer Mac:    
Pledging of Loans and Loans on Deposit    
Loans outstanding and pledged as collateral 4,742,964 4,837,570
RUS-guaranteed loans qualifying as permitted investments pledged | Collateral Trust Bonds 2007 Indenture    
Pledging of Loans and Loans on Deposit    
Loans outstanding and pledged as collateral $ 92,107 $ 95,152