Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) $ in Thousands	Apr. 26, 2020 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 351,141
Ending balance	351,141
Goodwill beginning balance	351,141
Signal Integrity
Goodwill [Roll Forward]
Beginning balance	274,085
Ending balance	274,085
Goodwill beginning balance	274,085
Wireless and Sensing
Goodwill [Roll Forward]
Beginning balance	72,128
Ending balance	72,128
Goodwill beginning balance	72,128
Protection
Goodwill [Roll Forward]
Beginning balance	4,928
Ending balance	4,928
Goodwill beginning balance	$ 4,928

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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