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Debt (Details) (USD $)
3 Months Ended
May 31, 2012
Feb. 29, 2012
May 31, 2012
2010 RCA
May 31, 2012
2010 RCA
Minimum
May 31, 2011
2010 RCA
Minimum
May 31, 2012
2010 RCA
Maximum
May 31, 2011
2010 RCA
Maximum
Short-term debt              
Unsecured total revolving commitment     $ 250,000,000        
Revolving loans outstanding 158,000,000 171,100,000          
Open letters of credit outstanding     350,000        
Interest rate (as a percent)       1.61% 1.95% 4.00% 4.00%
Amount available for borrowings     $ 91,650,000