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Fair Value Measurement (Details) - USD ($) $ in Thousands | Jul. 28, 2018 | Apr. 28, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | $ 27,352 | $ 34,522
Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 6,189 | 8,669
U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 1,986 | 992
U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 14,971 | 19,949
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 4,206 | 4,912
Reported Value Measurement [Member] | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 15,915 | 29,727
Restricted cash | 26 | 28
Derivatives - asset position | 145 | 41
Derivatives - liability position | (69) | (236)
Contingent liabilities | (2,309) | (1,000)
Assets (Liabilities), net | 41,060 | 63,082
Reported Value Measurement [Member] | Recurring Basis | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 6,189 | 8,669
Reported Value Measurement [Member] | Recurring Basis | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 1,986 | 992
Reported Value Measurement [Member] | Recurring Basis | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 14,971 | 19,949
Reported Value Measurement [Member] | Recurring Basis | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 4,206 | 4,912
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 15,915 | 29,727
Restricted cash | 26 | 28
Derivatives - asset position | 0 | 0
Derivatives - liability position | 0 | 0
Contingent liabilities | 0 | 0
Assets (Liabilities), net | 17,927 | 30,747
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1 | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 1,986 | 992
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1 | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 1 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Derivatives - asset position | 145 | 41
Derivatives - liability position | (69) | (236)
Contingent liabilities | 0 | 0
Assets (Liabilities), net | 25,442 | 33,335
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 6,189 | 8,669
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 14,971 | 19,949
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 4,206 | 4,912
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Derivatives - asset position | 0 | 0
Derivatives - liability position | 0 | 0
Contingent liabilities | (2,309) | (1,000)
Assets (Liabilities), net | (2,309) | (1,000)
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 3 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 3 | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 3 | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | 0 | 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 3 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available-for-sale securities: | $ 0 | $ 0

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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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