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Marketable Securities - Available-for-sale by Maturity Date (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 25, 2014
Schedule of Available-for-sale Securities  
Less than 12 months $ 10,264
Greater than 12 months 15,026
Total 25,290
Certificates of deposit
  
Schedule of Available-for-sale Securities  
Less than 12 months 4,443
Greater than 12 months 3,189
Total 7,632
U.S. Government securities
  
Schedule of Available-for-sale Securities  
Less than 12 months 2,001
Greater than 12 months 1,000
Total 3,001
U.S. Government sponsored entities
  
Schedule of Available-for-sale Securities  
Less than 12 months 0
Greater than 12 months 4,750
Total 4,750
Municipal obligations
  
Schedule of Available-for-sale Securities  
Less than 12 months 3,820
Greater than 12 months 6,087
Total $ 9,907