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Loans - Additional Information - Net Charge-offs (Details)
3 Months Ended 9 Months Ended 24 Months Ended 117 Months Ended 165 Months Ended
Feb. 28, 2026
USD ($)
Feb. 28, 2026
USD ($)
Feb. 28, 2025
USD ($)
May 31, 2022
loan
Feb. 28, 2026
USD ($)
Feb. 28, 2026
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charges-offs $ 306,000 $ 306,000 $ 0      
CFC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charges-offs 306,000 306,000        
Power supply | CFC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charges-offs 306,000 306,000        
Power supply | CFC | Loan Defaults            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charges-offs $ 300,000 $ 300,000        
Number of previously charged-off loans | loan       2    
Telecom | Rural Telephone Finance Cooperative            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charges-offs         $ 0  
Default amount         $ 0  
Electric | Rural Telephone Finance Cooperative            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charges-offs           $ 0
Default amount           $ 0