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Industry Segment Geographic Information and Significant Customers (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Jan. 02, 2016	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013
Revenue:
Total revenue		$ 206,420	$ 143,609	$ 148,788	$ 117,961	$ 159,342	$ 143,497	$ 139,803	$ 114,204	$ 616,778	$ 556,846	$ 487,401
Cost of revenue:
Total cost of revenue										327,852	298,791	266,247
Gross margin:
Gross margin		$ 95,327	$ 69,858	$ 70,033	$ 53,708	$ 76,335	$ 67,889	$ 62,121	$ 51,710	288,926	258,055	221,154
Research and development	[1]									76,071	69,408	63,649
Selling and marketing	[1]									97,772	86,091	71,529
General and administrative	[1]									54,465	49,439	53,358
Other expense, net										2,353	(708)	(203)
Income before income taxes										62,971	52,409	32,415
Home Robots [Member]
Revenue:
Total revenue										559,619	507,414	427,853
Cost of revenue:
Total cost of revenue										274,613	251,095	217,011
Gross margin:
Gross margin										285,006	256,319	210,842
Defense & Security Robots [Member]
Revenue:
Total revenue										55,004	45,502	50,003
Cost of revenue:
Total cost of revenue										29,737	24,409	24,975
Gross margin:
Gross margin										25,267	21,093	25,028
Other Segments [Member]
Revenue:
Total revenue										2,155	3,930	9,545
Cost of revenue:
Total cost of revenue										23,502	23,287	24,261
Gross margin:
Gross margin										$ (21,347)	$ (19,357)	$ (14,716)
[1] Stock-based compensation recorded in fiscal 2015, 2014 and 2013 breaks down by expense classification as follows: Fiscal Year Ended January 2, 2016 December 27, 2014 December 28, 2013 (In thousands)Cost of revenue$1,076 $865 $700Research and development3,256 3,359 2,700Selling and marketing1,457 1,296 1,246General and administrative8,394 8,258 8,763

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