XML 27 R35.htm IDEA: XBRL DOCUMENT v2.4.1.9

Goodwill, Other Intangible Assets and Other Assets - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Dec. 27, 2014
Business Acquisition [Line Items]
Goodwill	$ 48,751,000us-gaap_Goodwill		$ 48,751,000us-gaap_Goodwill
Amortization of Acquired Intangible Assets	900,000us-gaap_AmortizationOfIntangibleAssets	900,000us-gaap_AmortizationOfIntangibleAssets
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	41,100,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = irbt_EvolutionRoboticsIncErMember / us-gaap_StatementBusinessSegmentsAxis = irbt_HomeRobotsMember
Defense & Security | Nekton Research LLC [Member]
Business Acquisition [Line Items]
Goodwill	$ 7,700,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = irbt_NektonResearchLlcMember / us-gaap_StatementBusinessSegmentsAxis = irbt_DefenseAndSecurityMember

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

-Subparagraph (a)(2)

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

+ Details

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- Details

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X

- 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.

+ Details

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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=35741047&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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