Balance Sheet Components - International Government Grants (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Feb. 01, 2020	Jan. 26, 2019	Feb. 01, 2020	Jan. 26, 2019	Apr. 27, 2019
International Grants [Abstract]
Grant Income	$ 5.6	$ 5.7	$ 5.6	$ 5.7
Grants Receivable	$ 14.4		$ 14.4		$ 10.6

Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_GrantsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant