Fair Value Measurements - Additional Information (Details) - Level 3 $ in Millions	3 Months Ended
Jul. 25, 2020 USD ($) company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Preferred share investments with common share warrant, number of privately-held companies \| company	2
Additional investments of level 3 assets in the privately held company \| $	$ 1.1

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.

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

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration