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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 28, 2015	Dec. 27, 2014
Disclosure Summary Of Significant Accounting Policies Additional Information [Abstract]
Finite-Lived Intangible Assets, Gross	$ 27,000us-gaap_FiniteLivedIntangibleAssetsGross	$ 31,500us-gaap_FiniteLivedIntangibleAssetsGross
Finite-Lived Intangible Assets, Net	$ 18,274us-gaap_FiniteLivedIntangibleAssetsNet	$ 19,146us-gaap_FiniteLivedIntangibleAssetsNet

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- Details

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Namespace Prefix:	irbt_
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Period Type:	duration

X

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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

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Namespace Prefix:	us-gaap_
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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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

+ Details

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Namespace Prefix:	us-gaap_
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