XML 82 R66.htm IDEA: XBRL DOCUMENT v3.7.0.1
Long-Term Debt - Interest rates (Details) - Credit Agreement
$ in Thousands
 12 Months Ended
Feb. 28, 2017
USD ($)
item
Feb. 29, 2016
USD ($)
Feb. 28, 2015
USD ($)
Revolving Line of Credit      
Average borrowings outstanding | $ $ 498,420 $ 399,800 $ 300,280
Average interest rates during each year (as a percent) 2.20% 1.60% 2.50%
Weighted average interest rates on borrowings outstanding at year end (as a percent) 2.30% 2.80% 1.90%
Number of prior quarters used in calculation of average borrowings outstanding | item 4    
Minimum      
Revolving Line of Credit      
Interest rate range during each year (as a percent) 1.90% 1.40% 1.90%
Maximum      
Revolving Line of Credit      
Interest rate range during each year (as a percent) 4.30% 4.00% 4.40%