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Debt (Narrative) (Details)
12 Months Ended
May 31, 2020
USD ($)
Apr. 06, 2020
USD ($)
Mar. 31, 2020
USD ($)
May 26, 2019
USD ($)
Debt Instruments [Line Items]        
Long-term debt $ 939,100,000     $ 939,100,000
Long-term debt 928,800,000     927,700,000
Revolving Credit Agreement | Revolving Credit Facility        
Debt Instruments [Line Items]        
Maximum borrowing available under the credit facility $ 750,000,000.0      
Total debt to total capitalization ratio 0.75      
Outstanding balance of credit agreement $ 0      
Revolving Credit Agreement | Revolving Credit Facility | Prime Rate        
Debt Instruments [Line Items]        
Debt instrument, basis spread on variable rate (percentage) 0.075%      
Revolving Credit Agreement | Revolving Credit Facility | Federal Funds Effective Swap Rate        
Debt Instruments [Line Items]        
Debt instrument, basis spread on variable rate (percentage) 0.50%      
Revolving Credit Agreement | Revolving Credit Facility | Eurodollar        
Debt Instruments [Line Items]        
Debt instrument, basis spread on variable rate (percentage) 1.075%      
Revolving Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Debt Instruments [Line Items]        
Debt instrument, basis spread on variable rate (percentage) 1.075%      
Revolving Credit Agreement | Revolving Credit Facility | Base Rate        
Debt Instruments [Line Items]        
Debt instrument, basis spread on variable rate (percentage) 0.075%      
Term Loan        
Debt Instruments [Line Items]        
Total debt to total capitalization ratio   0.75    
Long-term debt   $ 270,000,000.0 $ 270,000,000.0  
Long-term debt   $ 370,000,000.0    
Debt instrument, interest rate (percentage) 3.75%      
6.800% senior notes due October 2037        
Debt Instruments [Line Items]        
Long-term debt $ 42,800,000     $ 42,800,000
Debt instrument, interest rate (percentage) 6.80%      
Maximum | 6.800% senior notes due October 2037        
Debt Instruments [Line Items]        
Debt instrument, interest rate, increase (percentage) 2.00%