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Marketable Securities - Available-for-sale by Maturity Date (Details)
$ in Thousands
Apr. 28, 2018
USD ($)
Schedule of Available-for-sale Securities  
Less than 12 months $ 19,808
Greater than 12 months 14,714
Total 34,522
Certificates of deposit  
Schedule of Available-for-sale Securities  
Less than 12 months 5,205
Greater than 12 months 3,464
Total 8,669
U.S. Government securities  
Schedule of Available-for-sale Securities  
Less than 12 months 0
Greater than 12 months 992
Total 992
U.S. Government sponsored entities  
Schedule of Available-for-sale Securities  
Less than 12 months 11,355
Greater than 12 months 8,594
Total 19,949
Municipal bonds  
Schedule of Available-for-sale Securities  
Less than 12 months 3,248
Greater than 12 months 1,664
Total $ 4,912