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SHORT-TERM DEBT (Details) (Credit Agreement, USD $)
 12 Months Ended
Feb. 28, 2013
item
Feb. 29, 2012
Feb. 28, 2011
Short-term debt      
Unsecured total revolving commitment $ 250,000,000    
Number of alternative methods under which interest on borrowings accrue 2    
Amount available for borrowings 167,700,000    
Average short-term debt 143,100,000 94,060,000 14,200,000
Average interest rate on short-term debt during each year (as a percent) 1.70% 2.20% 2.10%
Weighted average interest rate on short-term debt outstanding at year end (as a percent) 1.60% 2.10% 2.00%
Number of prior quarters ending balances of revolving line of credit used for computing average short-term debt 4    
Revolving loan
      
Short-term debt      
Amount outstanding 82,000,000    
Letter of credit
      
Short-term debt      
Amount outstanding $ 300,000    
Minimum
      
Short-term debt      
Interest rate range during each year (as a percent) 1.60% 2.00% 2.00%
Maximum
      
Short-term debt      
Interest rate range during each year (as a percent) 4.00% 4.00% 4.00%