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Marketable Securities - Available-for-sale by Maturity Date (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2013
Schedule of Available-for-sale Securities  
Less than 12 months $ 8,353
Greater than 12 months 15,699
Total 24,052
Certificates of deposit
 
Schedule of Available-for-sale Securities  
Less than 12 months 1,473
Greater than 12 months 3,204
Total 4,677
U.S. Government securities
 
Schedule of Available-for-sale Securities  
Less than 12 months 3,017
Greater than 12 months 2,001
Total 5,018
U.S. Government sponsored entities
 
Schedule of Available-for-sale Securities  
Less than 12 months 0
Greater than 12 months 4,752
Total 4,752
Municipal obligations
 
Schedule of Available-for-sale Securities  
Less than 12 months 3,863
Greater than 12 months 5,742
Total $ 9,605