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Fair Value Measurements (Tables)
9 Months Ended
Jan. 26, 2013
Fair Value Measurements [Abstract]  
Fair Value Hierarchy
The following table presents the fair value hierarchy for those assets measured at fair value on a recurring basis at January 26, 2013, and April 28, 2012:

As of January 26, 2013
 
Fair Value Measurements
 
(Unaudited, amounts in thousands)
 
Level 1(a)
  
Level 2(a)
  
Level 3
 
Assets
         
Available-for-sale securities
 $1,484  $30,986  $ 
Trading securities
     1,233    
Total
 $1,484  $32,219  $ 
(a)
There were no transfers between Level 1 and Level 2 during fiscal 2013.


As of April 28, 2012
 
Fair Value Measurements
 
(Unaudited, amounts in thousands)
 
Level 1(b)
  
Level 2(b)
  
Level 3
 
Assets
         
Available-for-sale securities
 $2,886  $7,364  $ 
Trading securities
     950    
Total
 $2,886  $8,314  $