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Note 5 - Investment Securities (Tables)
 12 Months Ended
Mar. 03, 2018
Notes Tables  
Marketable Securities [Table Text Block]
(in millions)   March 3, 2018   February 25, 2017
Available-for-sale securities:                
Long term   $
19.4
     $
19.3
  
                 
Trading securities:                
Short term    
86.3
      
-
  
Long term    
-
      
70.3
  
                 
Held-to-maturity securities:                
Short term    
291.7
      
-
  
Total investment securities   $
397.4
     $
89.6