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Note 7 - Investment Securities (Tables)
 9 Months Ended
Nov. 25, 2017
Notes Tables  
Marketable Securities [Table Text Block]
(in millions)   November 25,
2017		   February 25,
2017
Available-for-sale securities:                
Long term   $
19.5
     $
19.3
  
                 
Trading securities:                
Long term    
88.2
      
70.3
  
Total investment securities   $
107.7
     $
89.6