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Short-Term Borrowings (Details) - USD ($)
6 Months Ended
May 31, 2020
Nov. 30, 2019
Dec. 27, 2018
Short-term Debt [Line Items]      
Short-term borrowings $ 656,855,000 $ 548,490,000  
Interest rate on short-term borrowings outstanding 2.38%    
Line of Credit | JPMorgan Chase Bank, N.A.      
Short-term Debt [Line Items]      
Credit facility, maximum borrowing capacity     $ 296,000,000.0
Floating rate puttable notes      
Short-term Debt [Line Items]      
Short-term borrowings $ 6,800,000 0  
Equity-linked notes      
Short-term Debt [Line Items]      
Short-term borrowings 15,671,000 20,981,000  
Equity-linked notes due March 13, 2020      
Short-term Debt [Line Items]      
Short-term borrowings 5,200,000    
Intraday Credit Facility | Revolving Credit Facility      
Short-term Debt [Line Items]      
Credit facility, maximum borrowing capacity $ 150,000,000.0    
Debt instrument, interest rate 0.12%    
Intraday Credit Facility | Revolving Credit Facility | Base Rate      
Short-term Debt [Line Items]      
Basis spread on variable rate (as a percent) 3.00%    
Intraday Credit Facility | Revolving Credit Facility | Federal Funds Effective Rate      
Short-term Debt [Line Items]      
Basis spread on variable rate (as a percent) 0.50%    
Bank loans      
Short-term Debt [Line Items]      
Short-term borrowings $ 634,384,000 $ 527,509,000