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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jan. 27, 2018	Apr. 29, 2017
Schedule of Available-for-sale Securities
Amortized Cost	$ 24,023	$ 32,721
Unrealized Gains	0	14
Unrealized Losses	(86)	(22)
Fair Value	23,937	32,713
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	8,918	12,487
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	8,918	12,487
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost		400
Unrealized Gains		0
Unrealized Losses		0
Fair Value		400
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	9,104	12,260
Unrealized Gains	0	0
Unrealized Losses	(73)	(22)
Fair Value	9,031	12,238
Municipal bonds
Schedule of Available-for-sale Securities
Amortized Cost	6,001	7,574
Unrealized Gains	0	14
Unrealized Losses	(13)	0
Fair Value	$ 5,988	$ 7,588

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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