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Goodwill, Other Intangible Assets and Other Assets - Additional Information (Detail) (USD $)	3 Months Ended			3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013	Mar. 29, 2014 Minimum	Mar. 29, 2014 Maximum	Oct. 02, 2012 Home Robots Evolution Robotics, Inc. (ER)	Mar. 29, 2014 Defense & Security Nekton Research LLC [Member]	Sep. 30, 2008 Defense & Security Nekton Research LLC [Member]	Sep. 30, 2008 Defense and Security Reporting Unit Nekton Research LLC [Member]	Sep. 30, 2008 Research Reporting Unit [Member] Nekton Research LLC [Member]
Business Acquisition [Line Items]
Goodwill	$ 48,751,000		$ 48,751,000			$ 41,100,000	$ 7,700,000		$ 7,700,000	$ 200,000
Goodwill, Gross								7,900,000
Estimated useful life of intangible assets				2 years	10 years
Amortization of Acquired Intangible Assets	$ 900,000	$ 1,000,000

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 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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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

No definition available.

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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

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267



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X

- Definition

Amount before 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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-Section 50

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