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Fair Value Measurements - Level 3 Investments (Details) $ in Thousands | 12 Months Ended
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Apr. 28, 2018 USD ($) company | Apr. 29, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Unrealized gain in other comprehensive income | $ (650) |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Preferred share investments, number of privately-held companies | company | 2 |
Preferred share investments with common share warrant, number of privately-held companies | company | 1 |
Available-for-sale securities converted to cost basis investment | $ 3,000 |
New cost basis of preferred shares | $ 5,500 |
Level 3 | Available-for-sale investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Unrealized gain in other comprehensive income |  | $ 700
Discount rate (as a percent) |  | 30.00%

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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