v3.26.3
Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Derivative Instruments Having Rating Triggers (Details) - USD ($)
$ in Thousands
Aug. 31, 2026
May 31, 2026
Derivative [Line Items]    
Notional Amount $ 6,602,833 $ 6,565,533
Interest Rate Swap with Rating Trigger    
Derivative [Line Items]    
Notional Amount 4,732,325  
Payable Due from CFC (629)  
Receivable Due to CFC 423,604  
Net Receivable (Payable) 422,975  
Falls below A3/A- | Interest Rate Swap with Rating Trigger    
Derivative [Line Items]    
Notional Amount 14,000  
Payable Due from CFC (298)  
Receivable Due to CFC 0  
Net Receivable (Payable) (298)  
Falls below Baa1/BBB+ | Interest Rate Swap with Rating Trigger    
Derivative [Line Items]    
Notional Amount 3,284,282  
Payable Due from CFC (331)  
Receivable Due to CFC 301,202  
Net Receivable (Payable) 300,871  
Falls to or below Baa2/BBB | Interest Rate Swap with Rating Trigger    
Derivative [Line Items]    
Notional Amount 520,875  
Payable Due from CFC 0  
Receivable Due to CFC 23,481  
Net Receivable (Payable) 23,481  
Falls below Baa2/BBB | Interest Rate Swap with Rating Trigger    
Derivative [Line Items]    
Notional Amount 913,168  
Payable Due from CFC 0  
Receivable Due to CFC 98,921  
Net Receivable (Payable) $ 98,921