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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jan. 28, 2017 | Apr. 30, 2016
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 28,057 | $ 24,671
Unrealized Gains | 0 | 2
Unrealized Losses | (23) | (1)
Fair Value | 28,034 | 24,672
Certificates of deposit |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 13,076 | 14,927
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 13,076 | 14,927
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 | 7,666 | 8,523
Unrealized Gains | 0 | 0
Unrealized Losses | (22) | (1)
Fair Value | 7,644 | 8,522
Municipal obligations |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 6,915 | 1,221
Unrealized Gains | 0 | 2
Unrealized Losses | (1) | 0
Fair Value | $ 6,914 | $ 1,223

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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