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Document and Entity Information	3 Months Ended
	Mar. 30, 2019 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	MASI
Entity Registrant Name	MASIMO CORP
Entity Central Index Key	0000937556
Current Fiscal Year End Date	--12-28
Entity Filer Category	Large Accelerated Filer
Smaller Reporting Company	false
Emerging Growth Company	false
Entity Common Stock, Shares Outstanding	53,337,183

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Document and Entity Information [Abstract]

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