XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Balance Sheet Components Balance Sheet Components (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | Oct. 01, 2017 | Jan. 01, 2017
--- | --- | ---
Goodwill [Roll Forward] |  |
Goodwill (Period Start) | $ 85,463 | $ 85,463
Goodwill (Period End) | 85,463 | 85,463
Arlo [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill (Period Start) | 21,149 |
Goodwill (Period End) | 21,149 | 21,149
Connected Home [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill (Period Start) | 28,035 |
Goodwill (Period End) | 28,035 | 28,035
SMB [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill (Period Start) | 36,279 |
Goodwill (Period End) | $ 36,279 | $ 36,279

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_GoodwillRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ntgr_ArloMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ntgr_ConnectedHomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ntgr_SMBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |