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Long-Term Debt - Schedule (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 13, 2020
Aug. 31, 2020
May 31, 2020
Aug. 31, 2020
Feb. 29, 2020
Long-term debt          
Line of Credit Facility, Accordion Feature, Maximum Allowable Increase $ 300,000,000   $ 200,000,000    
Maximum additional debt allowed under debt covenants   $ 893,500,000   $ 893,500,000  
Remaining principal balance due on March 1, 2022   1,900,000   1,900,000  
Minimum | Base rate          
Long-term debt          
Interest rate 0.00%        
Minimum | Eurodollar          
Long-term debt          
Interest rate 1.00%        
Maximum | Base rate          
Long-term debt          
Interest rate 1.00%        
Maximum | Eurodollar          
Long-term debt          
Interest rate 2.00%        
Credit agreement          
Long-term debt          
Maximum revolving commitment $ 1,250,000,000       $ 1,000,000,000.0
Maximum additional debt allowed in the event of a qualified acquisition   $ 955,000,000.0   $ 955,000,000.0  
Credit agreement | Minimum          
Long-term debt          
Interest rate range during the period (as a percent)   1.15%   1.15%  
Credit agreement | Maximum          
Long-term debt          
Interest rate range during the period (as a percent)   1.19%   4.75%  
MBFC loan          
Long-term debt          
Amount available for borrowings   $ 955,000,000.0   $ 955,000,000.0  
Aggregate principal balance   18,600,000   18,600,000  
Remaining principal balance due on March 1, 2021   1,900,000   1,900,000  
Remaining principal balance due on March 1, 2022   1,900,000   1,900,000  
Remaining principal balance due on March 1, 2023   14,800,000   $ 14,800,000  
MBFC loan | Base rate          
Long-term debt          
Interest rate       1.00%  
Revolving loan | Credit agreement          
Long-term debt          
Amount outstanding   286,000,000.0   $ 286,000,000.0  
Letter of credit | Credit agreement          
Long-term debt          
Amount outstanding   $ 9,000,000.0   $ 9,000,000.0