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Summary of Significant Accounting Policies Additional Information (Details) - USD ($)
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Jul. 01, 2016
Summary of Significant Accounting Policies [Line Items]        
Repossessed Assets $ 0 $ 0    
Deferred income 65,922,000 73,972,000    
Real Estate Held-for-sale 14,000,000      
Restricted cash 7,825,000 21,806,000    
Escrow Deposit 1,500,000     $ 16,000,000
Escrow Deposit Released 14,500,000      
Depreciation and amortization 7,931,000 7,173,000 $ 7,327,000  
Deferred Loan Conversion Fees 60,000,000 68,000,000    
Accumulated other comprehensive income $ 8,544,000 $ 13,175,000 $ 1,058,000  
Maximum        
Summary of Significant Accounting Policies [Line Items]        
Estimated useful lives 40 years      
Minimum        
Summary of Significant Accounting Policies [Line Items]        
Estimated useful lives 3 years      
NCSC        
Summary of Significant Accounting Policies [Line Items]        
Membership fees (in dollars per share) $ 100      
Effective percentage of tax rate 34.00% 38.00% 38.00%  
Deferred Tax Assets, Net $ 2,000,000 $ 4,000,000    
RTFC        
Summary of Significant Accounting Policies [Line Items]        
Effective percentage of tax rate 35.00% 40.00% 38.00%  
RTFC | Minimum        
Summary of Significant Accounting Policies [Line Items]        
Percentage of income from patronage sources allocated to borrowers to be retired in cash prior to filing the applicable tax return 20.00%      
Distribution system members | CFC        
Summary of Significant Accounting Policies [Line Items]        
Membership fees (in dollars per share) $ 1,000      
Service organization members | CFC        
Summary of Significant Accounting Policies [Line Items]        
Membership fees (in dollars per share) 200      
Associates | CFC        
Summary of Significant Accounting Policies [Line Items]        
Membership fees (in dollars per share) 1,000      
Associates | RTFC        
Summary of Significant Accounting Policies [Line Items]        
Membership fees (in dollars per share) 100      
Voting members | RTFC        
Summary of Significant Accounting Policies [Line Items]        
Membership fees (in dollars per share) $ 1,000      
Unadvanced commitments not subject to material adverse change clauses        
Summary of Significant Accounting Policies [Line Items]        
Loans and Leases Receivable Unadvanced Commitments Period Maximum 5 years      
Unadvanced commitments        
Summary of Significant Accounting Policies [Line Items]        
Loans and Leases Receivable Unadvanced Commitments Period Maximum 5 years