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Debt (Details) - Credit Agreement
3 Months Ended 9 Months Ended
Nov. 30, 2015
USD ($)
Nov. 30, 2014
Nov. 30, 2015
USD ($)
item
Nov. 30, 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 $ 267,600,000   $ 267,600,000  
Minimum        
Revolving Line of Credit        
Interest rate range during each year (as a percent) 1.44% 1.90% 1.43% 1.90%
Maximum        
Revolving Line of Credit        
Interest rate range during each year (as a percent) 3.75% 4.38% 4.00% 4.38%
Revolving loan        
Revolving Line of Credit        
Amount outstanding $ 380,900,000   $ 380,900,000  
Letter of credit        
Revolving Line of Credit        
Amount outstanding $ 1,500,000   $ 1,500,000