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Fair Value Measurements - Level 3 Investments (Details) - Level 3 $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 25, 2020 USD ($) company | Oct. 26, 2019 USD ($) | Jan. 25, 2020 company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Preferred share investments, number of privately-held companies | company | 2 |  | 2
Preferred share investments with common share warrant, number of privately-held companies | company | 1 |  | 1
Increase in fair value of investment | $ |  | $ 0.5 |
Impairment charge for carrying value | $ | $ 6.0 |  |
Joybird |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Discount rate for fiscal 2021 milestone contingent consideration |  |  | 4.20%
Discount rate for fiscal 2023 milestone contingent consideration |  |  | 4.70%

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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