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Long-Term Debt - Schedule (Details)
3 Months Ended 6 Months Ended
Aug. 31, 2018
Aug. 31, 2019
USD ($)
method
Aug. 31, 2018
Minimum | Credit agreement      
Long-term debt      
Interest rate range during each year (as a percent) 2.90% 3.10% 2.80%
Maximum | Credit agreement      
Long-term debt      
Interest rate range during each year (as a percent) 5.00% 5.50% 5.00%
MBFC loan      
Long-term debt      
Remaining principal balance due on March 1, 2023   $ 14,800,000  
Credit agreement      
Long-term debt      
Maximum revolving commitment   $ 1,000,000,000.0  
Number of alternative methods under which interest on borrowings accrue | method   2  
Amount available for borrowings   $ 708,000,000.0  
Maximum additional debt allowed under debt covenants   609,000,000.0  
Revolving loan | Credit agreement      
Long-term debt      
Amount outstanding   283,000,000.0  
Letter of credit | Credit agreement      
Long-term debt      
Amount outstanding   $ 9,000,000.0