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Marketable Securities - Available-for-sale by Maturity Date (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 28, 2012
Schedule of Available-for-sale Securities  
Less than 12 months $ 10,284
Greater than 12 months 14,766
Total 25,050
Certificates of deposit
 
Schedule of Available-for-sale Securities  
Less than 12 months 5,187
Greater than 12 months 1,977
Total 7,164
U.S. Government securities
 
Schedule of Available-for-sale Securities  
Less than 12 months 3,510
Greater than 12 months 3,029
Total 6,539
U.S. Government sponsored entities
 
Schedule of Available-for-sale Securities  
Less than 12 months 0
Greater than 12 months 5,203
Total 5,203
Municipal obligations
 
Schedule of Available-for-sale Securities  
Less than 12 months 1,587
Greater than 12 months 4,557
Total $ 6,144