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Debt (Details) (USD $)
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2012
Feb. 29, 2012
Nov. 30, 2012
Credit Agreement
item
Nov. 30, 2012
Credit Agreement
Minimum
Nov. 30, 2012
Credit Agreement
Minimum
Nov. 30, 2012
Credit Agreement
Maximum
Nov. 30, 2012
Credit Agreement
Maximum
Revolving Line of Credit              
Unsecured total revolving commitment     $ 250,000,000        
Accrued interest on borrowings, number of alternative methods     2        
Revolving loans outstanding 143,400,000 171,100,000 143,400,000        
Open letters of credit outstanding     430,000        
Interest rate (as a percent)       1.59% 1.59% 4.00% 4.00%
Amount available for borrowings     $ 106,170,000