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Fair Value Measurements (Details) (Recurring Basis [Member], USD $)
In Thousands, unless otherwise specified
Jan. 26, 2013
Apr. 28, 2012
Level 1 [Member]
   
Assets    
Available-for-sale securities $ 1,484 [1] $ 2,886 [2]
Trading securities 0 [1] 0 [2]
Total 1,484 [1] 2,886 [2]
Level 2 [Member]
   
Assets    
Available-for-sale securities 30,986 [1] 7,364 [2]
Trading securities 1,233 [1] 950 [2]
Total 32,219 [1] 8,314 [2]
Level 3 [Member]
   
Assets    
Available-for-sale securities 0 0
Trading securities 0 0
Total $ 0 $ 0
[1] There were no transfers between Level 1 and Level 2 during fiscal 2013.
[2] There were no transfers between Level 1 and Level 2 during fiscal 2012.