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Marketable Securities - Available-for-sale by Maturity Date (Details) $ in Thousands	Apr. 27, 2019 USD ($)
Schedule of Available-for-sale Securities
Less than 12 months	$ 21,877
Greater than 12 months	4,467
Total	26,344
Certificates of deposit
Schedule of Available-for-sale Securities
Less than 12 months	2,234
Greater than 12 months	1,230
Total	3,464
U.S. Government securities
Schedule of Available-for-sale Securities
Less than 12 months	10,774
Greater than 12 months	0
Total	10,774
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Less than 12 months	7,245
Greater than 12 months	3,237
Total	10,482
Municipal bonds
Schedule of Available-for-sale Securities
Less than 12 months	1,624
Greater than 12 months	0
Total	$ 1,624

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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