Goodwill and Intangible Assets - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
Apr. 29, 2018 USD ($)	Jan. 27, 2019 reporting_unit
Goodwill [Line Items]
Number of reporting units \| reporting_unit		3
Wireless and Sensing
Goodwill [Line Items]
Goodwill \| $	$ 49.4

Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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