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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jul. 29, 2017	Apr. 29, 2017
Schedule of Available-for-sale Securities
Amortized Cost	$ 25,028	$ 32,721
Unrealized Gains	16	14
Unrealized Losses	(24)	(22)
Fair Value	25,020	32,713
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	11,028	12,487
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	11,028	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	7,667	12,260
Unrealized Gains	0	0
Unrealized Losses	(24)	(22)
Fair Value	7,643	12,238
Municipal obligations
Schedule of Available-for-sale Securities
Amortized Cost	6,333	7,574
Unrealized Gains	16	14
Unrealized Losses	0	0
Fair Value	$ 6,349	$ 7,588

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+ References

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-Publisher FASB
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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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