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Note 6 - Investment Securities (Tables)
 3 Months Ended
May 27, 2017
Notes Tables  
Marketable Securities [Table Text Block]
(in millions)   May 27,
2017		   February 25,
2017
Available-for-sale securities:                
Long term   $
19.5
     $
19.3
  
                 
Trading securities:                
Long term    
76.6
      
70.3
  
Total investment securities   $
96.1
     $
89.6