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Goodwill, Other Intangible Assets and Other Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015	Apr. 02, 2016	Jan. 02, 2016
Business Acquisition [Line Items]
Goodwill	$ 41,041		$ 41,041		$ 48,800	$ 48,751
Amortization of Acquired Intangible Assets	$ 900	$ 900	$ 1,700	$ 1,800
Minimum
Business Acquisition [Line Items]
Estimated useful life of intangible assets			3 years
Maximum
Business Acquisition [Line Items]
Estimated useful life of intangible assets			10 years
Home Robots | Evolution Robotics, Inc. (ER)
Business Acquisition [Line Items]
Goodwill					41,100
Defense & Security | Nekton Research LLC [Member]
Business Acquisition [Line Items]
Goodwill					$ 7,700

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- 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.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- 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)
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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