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Fair Value Measurements (Tables)
3 Months Ended
Jul. 02, 2011
Fair Value Measurements (Tables) [Abstract]  
Company's financial assets and liabilities measured at fair value on a recurring basis
 
                 
    July 2,
    April 2,
 
    2011     2011  
    (millions)  
 
Financial assets carried at fair value:
               
Municipal bonds(a)
  $ 36.2     $ 100.4  
Variable rate municipal securities(a)
          14.5  
Auction rate securities(b)
    2.3       2.3  
Other securities(a)
    0.4       0.5  
Derivative financial instruments(b)
    4.6       2.0  
                 
Total
  $ 43.5     $ 119.7  
                 
Financial liabilities carried at fair value:
               
Derivative financial instruments(b)
  $ 19.1     $ 17.8  
                 
Total
  $ 19.1     $ 17.8  
                 
 
 
(a) Based on Level 1 measurements.
 
(b) Based on Level 2 measurements.