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Marketable Securities - Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013
Schedule of Available-for-sale Securities
Amortized Cost	$ 25,392	$ 24,024
Unrealized Gains	14	28
Unrealized Losses	(8)	0
Fair Value	25,398	24,052
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	7,734	4,677
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	7,734	4,677
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost	2,000	4,999
Unrealized Gains	2	19
Unrealized Losses	0	0
Fair Value	2,002	5,018
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	8,349	4,752
Unrealized Gains	0	0
Unrealized Losses	(8)	0
Fair Value	8,341	4,752
Municipal obligations
Schedule of Available-for-sale Securities
Amortized Cost	7,309	9,596
Unrealized Gains	12	9
Unrealized Losses	0	0
Fair Value	$ 7,321	$ 9,605

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- Definition

Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investment

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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-Name Accounting Standards Codification

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