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Debt (Details) - Credit Agreement
3 Months Ended 6 Months Ended
Aug. 31, 2015
USD ($)
Aug. 31, 2014
Aug. 31, 2015
USD ($)
item
Aug. 31, 2014
Revolving Line of Credit        
Unsecured revolving commitment $ 650,000,000   $ 650,000,000  
Number of alternative methods under which interest on borrowings accrue | item     2  
Amount available for borrowings $ 263,000,000   $ 263,000,000  
Minimum        
Revolving Line of Credit        
Interest rate range during each year (as a percent) 1.43% 1.90% 1.43% 1.90%
Maximum        
Revolving Line of Credit        
Interest rate range during each year (as a percent) 3.50% 4.00% 4.00% 4.00%
Revolving loan        
Revolving Line of Credit        
Amount outstanding $ 385,500,000   $ 385,500,000  
Letter of credit        
Revolving Line of Credit        
Amount outstanding $ 1,500,000   $ 1,500,000