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Marketable Securities - Available-for-sale by Maturity Date (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 26, 2014
Schedule of Available-for-sale Securities  
Less than 12 months $ 7,556
Greater than 12 months 17,842
Total 25,398
Certificates of deposit
  
Schedule of Available-for-sale Securities  
Less than 12 months 4,198
Greater than 12 months 3,536
Total 7,734
U.S. Government securities
  
Schedule of Available-for-sale Securities  
Less than 12 months 1,001
Greater than 12 months 1,001
Total 2,002
U.S. Government sponsored entities
  
Schedule of Available-for-sale Securities  
Less than 12 months 0
Greater than 12 months 8,341
Total 8,341
Municipal obligations
  
Schedule of Available-for-sale Securities  
Less than 12 months 2,357
Greater than 12 months 4,964
Total $ 7,321