XML 82 R71.htm IDEA: XBRL DOCUMENT
v3.20.2

Leases (Narrative) (Details) | 6 Months Ended
--- | ---
Jun. 28, 2020
Lessee, Lease, Description [Line Items] |
Lease expiration date | December 2026
Maximum |
Lessee, Lease, Description [Line Items] |
Operating lease, remaining lease term | 6 years
Operating lease, renewal term option | 5 years
Minimum |
Lessee, Lease, Description [Line Items] |
Operating lease, remaining lease term | 1 year

X
- Definition Non-cancelable leases expiration date. + References No definition available. + Details
Name: | ntgr_NonCancelableLeasesExpirationDate
Namespace Prefix: | ntgr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Lease, Remaining Lease Term + References No definition available. + Details
Name: | ntgr_OperatingLeaseRemainingLeaseTerm
Namespace Prefix: | ntgr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |