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The Company and Basis of Presentation - Narrative (Details)					3 Months Ended	6 Months Ended	9 Months Ended
	Dec. 31, 2018 shares	Dec. 17, 2018	Nov. 29, 2018 shares	Aug. 07, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Jul. 01, 2018 USD ($)	Sep. 29, 2019 region	Aug. 02, 2018 $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Number of geographic regions in which the Company conducts business | region							3
Allocation of Corporate Expenses | NETGEAR
Subsidiary, Sale of Stock [Line Items]
Purchases from related party					$ 0	$ 30,600,000
Research and development | Allocation of Corporate Expenses | NETGEAR
Subsidiary, Sale of Stock [Line Items]
Purchases from related party						9,400,000
Sales and marketing | Allocation of Corporate Expenses | NETGEAR
Subsidiary, Sale of Stock [Line Items]
Purchases from related party						10,000,000.0
General and administrative | Allocation of Corporate Expenses | NETGEAR
Subsidiary, Sale of Stock [Line Items]
Purchases from related party						$ 11,200,000
IPO
Subsidiary, Sale of Stock [Line Items]
Common stock, issued (in shares) | shares				11,747,250				10,215,000
Stock price, common stock (in dollars per share) | $ / shares				$ 16.00				$ 16.00
Proceeds from initial public offering, net of offering costs				$ 173,400,000
Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Common stock, issued (in shares) | shares				1,532,250
Arlo | IPO
Subsidiary, Sale of Stock [Line Items]
Proceeds from initial public offering, net of offering costs				$ 1,400,000
Payments for offering costs				4,600,000
NETGEAR | IPO
Subsidiary, Sale of Stock [Line Items]
Payments for offering costs				$ 3,200,000
Percentage of shares owned				84.20%
NETGEAR | Special Stock Dividend Distribution
Subsidiary, Sale of Stock [Line Items]
Number of shares authorized (in shares) | shares			62,500,000
Ratio of Arlo to NETGEAR common stock (as a ratio)		1.980295
Number of shares issued (in shares) | shares	62,500,000

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