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Marketable Securities - Available-for-sale by Maturity Date (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 26, 2013
Schedule of Available-for-sale Securities  
Less than 12 months $ 9,752
Greater than 12 months 15,787
Total 25,539
Certificates of deposit
 
Schedule of Available-for-sale Securities  
Less than 12 months 4,199
Greater than 12 months 2,958
Total 7,157
U.S. Government securities
 
Schedule of Available-for-sale Securities  
Less than 12 months 3,011
Greater than 12 months 3,007
Total 6,018
U.S. Government sponsored entities
 
Schedule of Available-for-sale Securities  
Less than 12 months 0
Greater than 12 months 4,746
Total 4,746
Municipal obligations
 
Schedule of Available-for-sale Securities  
Less than 12 months 2,542
Greater than 12 months 5,076
Total $ 7,618