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Fair Value Measurements (Details) (Recurring Basis [Member], USD $)
In Thousands, unless otherwise specified
Oct. 26, 2013
Apr. 27, 2013
Level 1 [Member]
   
Assets [Abstract]    
Available-for-sale securities $ 3,640 [1] $ 1,217 [2]
Trading securities 0 [1] 0 [2]
Total 3,640 [1] 1,217 [2]
Level 2 [Member]
   
Assets [Abstract]    
Available-for-sale securities 41,024 [1] 38,747 [2]
Trading securities 1,439 [1] 1,126 [2]
Total 42,463 [1] 39,873 [2]
Level 3 [Member]
   
Assets [Abstract]    
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 2014.
[2] There were no transfers between Level 1 and Level 2 during fiscal 2013.