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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Apr. 28, 2018	Apr. 29, 2017
Schedule of Available-for-sale Securities
Amortized Cost	$ 34,676	$ 32,721
Unrealized Gains	0	14
Unrealized Losses	(154)	(22)
Fair Value	34,522	32,713
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	8,669	12,487
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	8,669	12,487
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost	999	400
Unrealized Gains	0	0
Unrealized Losses	(7)	0
Fair Value	992	400
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	20,072	12,260
Unrealized Gains	0	0
Unrealized Losses	(123)	(22)
Fair Value	19,949	12,238
Municipal bonds
Schedule of Available-for-sale Securities
Amortized Cost	4,936	7,574
Unrealized Gains	0	14
Unrealized Losses	(24)	0
Fair Value	$ 4,912	$ 7,588

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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