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Long-Term Debt - Receivable Financing Facility (Details) - Secured Debt
Jun. 27, 2020
USD ($)
facility
May 31, 2020
USD ($)
May 31, 2019
USD ($)
Receivables Financing Facilities      
Line of Credit Facility [Line Items]      
Number of receivable financing facilities | facility 2    
Receivable financing facility, up to $ 280,000,000    
Accounts receivable pledged 417,000,000    
Line of credit, current $ 229,000,000    
Average interest rate 1.13%    
Receivables Financing Facility, due 2021      
Line of Credit Facility [Line Items]      
Receivable financing facility, up to     $ 180,000,000
Receivables Financing Facility, due 2020      
Line of Credit Facility [Line Items]      
Receivable financing facility, up to   $ 100,000,000