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Fair Value Measurements - Level 3 Investments (Details) $ in Thousands	12 Months Ended
	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%

X

- Definition

The amount of available-for-sale securities converted to cost basis investments during the period.

+ References

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- Definition

The number of privately-held companies in which the entity holds investments in preferred shares.

+ References

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- Definition

The number of investments in privately-held companies in which the entity holds a warrant to purchase common shares.

+ References

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- Definition

The cost basis amount of an investment in preferred shares acquired during the period, both directly and through conversion of available-for-sale debt securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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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

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