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Note 5 - Investment Securities (Tables)
6 Months Ended
Aug. 27, 2016
Notes Tables  
Marketable Securities [Table Text Block]
(in millions)   August 27,
2016
  February 27,
2016
Available-for-sale securities:                
Long term   $ 19.6     $ 19.8  
                 
Trading securities:                
Long term     63.1       51.5  
                 
Held-to-maturity securities:                
Short term     -       86.2  
Total investment securities   $ 82.7     $ 157.5