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SHORT-TERM DEBT (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2014
Credit Agreement
item
Feb. 07, 2014
Credit Agreement
Feb. 06, 2014
Credit Agreement
Feb. 07, 2014
Credit Agreement
Period prior to fiscal year ending February 28, 2015 Compliance Certificate date
Maximum
Feb. 07, 2014
Credit Agreement
Period after fiscal year ending February 28, 2015 Compliance Certificate date
Maximum
Feb. 28, 2014
Credit Agreement
Revolving loan
item
Feb. 28, 2013
Credit Agreement
Revolving loan
Feb. 29, 2012
Credit Agreement
Revolving loan
Feb. 28, 2014
Credit Agreement
Revolving loan
Minimum
Feb. 28, 2013
Credit Agreement
Revolving loan
Minimum
Feb. 29, 2012
Credit Agreement
Revolving loan
Minimum
Feb. 28, 2014
Credit Agreement
Revolving loan
Maximum
Feb. 28, 2013
Credit Agreement
Revolving loan
Maximum
Feb. 29, 2012
Credit Agreement
Revolving loan
Maximum
Feb. 28, 2014
Credit Agreement
Letter of credit
Mar. 14, 2014
Subsequent event
Dutch auction self tender
Credit Agreement
Revolving Line of Credit                                      
Unsecured total revolving commitment         $ 375,000,000 $ 250,000,000                          
Leverage Ratio             2.75 2.50                      
Number of alternative methods under which interest on borrowings accrue       2                              
Amount outstanding                 0                 280,000  
Amount available for borrowings       374,720,000                              
Average short-term debt                 29,680,000 143,100,000 94,060,000                
Average interest rate on short-term debt during each year (as a percent)                 1.30% 1.70% 2.20%                
Interest rate range during each year (as a percent)                       1.20% 1.60% 2.00% 3.60% 4.00% 4.00%    
Weighted average interest rate on short-term debt outstanding at year end (as a percent)                 0.00% 1.60% 2.10%                
Number of prior quarters ending balances of revolving line of credit used for computing average short-term debt                 4                    
Principal amount of borrowing $ 107,300,000 $ 234,650,000 $ 1,369,850,000                               $ 200,000,000