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Summary of Significant Accounting Policies Income taxes (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income taxes [Abstract]
Valuation allowance	$ 3,826	$ 1,148	$ 800

X

- Definition

Income taxes [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	irbt_
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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Period Type:	instant