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Debt (Details) (Credit Agreement, USD $)
In Millions, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2014
item
Jun. 11, 2014
Jun. 10, 2014
Aug. 31, 2014
Revolving loan
Aug. 31, 2014
Letter of credit
Aug. 31, 2014
Minimum
Aug. 31, 2013
Minimum
Aug. 31, 2014
Minimum
Aug. 31, 2013
Minimum
Aug. 31, 2014
Maximum
Aug. 31, 2013
Maximum
Aug. 31, 2014
Maximum
Aug. 31, 2013
Maximum
Revolving Line of Credit                          
Total revolving commitment $ 570 $ 570 $ 375                    
Number of alternative methods under which interest on borrowings accrue 2                        
Amount outstanding       488.90 1.32                
Interest rate range during each year (as a percent)           1.90% 1.18% 1.90% 1.18% 4.00% 3.63% 4.00% 3.63%
Amount available for borrowings $ 79.78