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SHORT-TERM DEBT (Details) (USD $)
12 Months Ended 12 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
2010 RCA
Dec. 15, 2011
2010 RCA
Feb. 29, 2012
2010 RCA
Federal Funds Rate
Feb. 29, 2012
2010 RCA
LIBOR
Feb. 29, 2012
2010 RCA
Alternative base rate
Feb. 29, 2012
2010 RCA
Minimum
Feb. 29, 2012
2010 RCA
Minimum
Alternative base rate
Feb. 29, 2012
2010 RCA
Maximum
Feb. 29, 2012
2010 RCA
Maximum
Alternative base rate
Short-term debt                      
Unsecured total revolving commitment     $ 250,000,000                
Unsecured total revolving commitment, before amendment       150,000,000              
Amount outstanding     171,100,000                
Margin (as a percent)         0.50% 1.00%   0.00% 1.00% 1.125% 2.125%
Federal Funds Rate         Federal Funds Rate plus 0.50 percent one-month LIBOR 1, 2, 3, or 6-month LIBOR        
Loan commitment fees on unused balance (as a percent)               0.25%   0.45%  
Letter of credit fees (as a percent)               1.00%   2.125%  
Revolving loans outstanding 171,100,000 71,000,000                  
Open letters of credit outstanding     340,000                
Interest rate (as a percent)               1.94%   4.00%  
Amount available for borrowings     78,560,000                
Limit on additional debt borrowings $ 254,400,000