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Equity Additional Information (Details)
$ in Thousands
12 Months Ended
May 31, 2018
USD ($)
reserve
May 31, 2017
USD ($)
May 31, 2016
USD ($)
May 31, 2015
USD ($)
Equity        
Stockholders' Equity, Period Increase (Decrease) $ 407,000      
Total equity 1,505,853 $ 1,098,805 $ 817,378 $ 911,786
Net income (loss) 457,364 312,099 (51,516)  
Retirement/allocation of net earnings authorized $ (45,220) (42,490) (39,384)  
Minimum percentage of paid-in-capital required to be maintained under District of Columbia cooperative law 50.00%      
Accumulated other comprehensive income expected to be reclassified into earnings over the next 12 months $ 1,000      
Patronage Capital Allocated        
Equity        
Total equity 811,493 761,701 713,853 668,980
Net income (loss) 95,012 90,441 84,257  
Retirement/allocation of net earnings authorized (45,220) (42,593) (39,384)  
Members' capital reserve        
Equity        
Total equity 687,785 630,305 587,219 $ 501,731
Net income (loss) $ 57,480 43,086 $ 85,917  
CFC        
Equity        
General reserve required to be maintained as a percentage of membership fees collected 50.00%      
Number of additional board-approved reserves | reserve 1      
CFC | Cooperative educational fund        
Equity        
Allocation of net earnings $ 1,000 1,000    
CFC | Cooperative educational fund | Minimum        
Equity        
Minimum percentage of net earnings to be allocated to cooperative education fund as per bylaws of the entity 0.25%      
CFC | Patronage Capital Allocated        
Equity        
Retirement/allocation of net earnings authorized $ (48,000) (45,000)    
Percentage of prior year's allocated patronage capital required to be retired 50.00%      
Percentage of prior year's allocated patronage capital required to be held 50.00%      
Period for which prior year's allocated patronage capital is required to be held 25 years      
Allocation of net earnings $ 95,000 90,000    
Retirement of allocated net earnings, percentage 50.00%      
CFC | Members' capital reserve        
Equity        
Allocation of net earnings $ 57,000 $ 43,000    
RTFC        
Equity        
Minimum percentage of paid-in-capital required to be maintained under District of Columbia cooperative law 50.00%      
Percentage of ownership by parent 100.00%      
Percentage of ownership by minority owners 100.00%      
RTFC | Minimum        
Equity        
Percentage of retirement of allocated net earnings in cash 20.00%      
RTFC | Cooperative educational fund | Minimum        
Equity        
Minimum percentage of net earnings to be allocated to cooperative education fund as per bylaws of the entity 1.00%      
NCSC        
Equity        
Minimum percentage of paid-in-capital required to be maintained under District of Columbia cooperative law 50.00%      
NCSC | Cooperative educational fund | Minimum        
Equity        
Minimum percentage of net earnings to be allocated to cooperative education fund as per bylaws of the entity 0.25%