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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Oct. 29, 2016	Apr. 30, 2016
Schedule of Available-for-sale Securities
Amortized Cost	$ 17,906	$ 24,671
Unrealized Gains	0	2
Unrealized Losses	(2)	(1)
Fair Value	17,904	24,672
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	13,804	14,927
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	13,804	14,927
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost	401
Unrealized Gains	0
Unrealized Losses	0
Fair Value	401
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	2,201	8,523
Unrealized Gains	0	0
Unrealized Losses	(2)	(1)
Fair Value	2,199	8,522
Municipal obligations
Schedule of Available-for-sale Securities
Amortized Cost	1,500	1,221
Unrealized Gains	0	2
Unrealized Losses	0	0
Fair Value	$ 1,500	$ 1,223

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+ References

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-Publisher FASB
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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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