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Related Party Transactions Related Party Transactions - (Details)		3 Months Ended		6 Months Ended
	Jul. 08, 2021 USD ($)	Jul. 03, 2021 USD ($)	Jun. 27, 2020 USD ($)	Jul. 03, 2021 USD ($) ft²	Jun. 27, 2020 USD ($)	Jan. 02, 2021 USD ($)
Related Party Transaction [Line Items]
Related Party Transactions Disclosure				3. Related Party Transactions The Company’s Chairman and Chief Executive Officer (CEO) is also the Chairman and CEO of Cercacor Laboratories, Inc. (Cercacor). The Company is a party to the following agreements with Cercacor: •Cross-Licensing Agreement - The Company and Cercacor are parties to a cross-licensing agreement (Cross-Licensing Agreement), which governs each party’s rights to certain intellectual property held by the two companies. The Company is subject to certain annual minimum aggregate royalty obligations for use of the rainbow® licensed technology. The current annual minimum royalty obligation is $5.0 million. Aggregate liabilities payable to Cercacor arising under the Cross-Licensing Agreement were $3.2 million and $3.1 million for the three months ended July 3, 2021 and June 27, 2020, respectively. Aggregate liabilities payable to Cercacor arising under the Cross-Licensing Agreement were $6.7 million and $6.2 million for the six months ended July 3, 2021 and June 27, 2020, respectively. •Administrative Services Agreement - The Company is a party to an administrative services agreement with Cercacor (G&A Services Agreement), which governs certain general and administrative services that the Company provides to Cercacor. Amounts charged by the Company pursuant to the G&A Services Agreement were less than $0.1 million for each of the three months ended July 3, 2021 and June 27, 2020. Amounts charged by the Company pursuant to the G&A Services Agreement were less than $0.1 million and $0.2 million for the six months ended July 3, 2021 and June 27, 2020, respectively. •Lease and Sublease Agreements - Effective December 2019, the Company entered into a lease agreement with Cercacor for approximately 34,000 square feet of office, research and development space at one of the Company’s owned facilities in Irvine (Cercacor Lease). The term of the Cercacor Lease expires on December 31, 2024. In March 2016, the Company entered into a sublease agreement with Cercacor for approximately 16,830 square feet of excess office and laboratory space located at 40 Parker, Irvine, California (Cercacor Sublease). The Cercacor Sublease began on May 1, 2016 and expired on December 15, 2019. The Company recognized approximately $0.3 million of lease income for each of the three months ended July 3, 2021 and June 27, 2020. The Company recognized approximately $0.6 million and $0.5 million of lease income for the six months ended July 3, 2021 and June 27, 2020, respectively. Net amounts due to Cercacor at each of July 3, 2021 and January 2, 2021 were approximately $3.1 million and $3.6 million, respectively. The Company’s CEO is also the Chairman of the Masimo Foundation for Ethics, Innovation and Competition in Healthcare (Masimo Foundation), a non-profit organization that was founded in 2010 to provide a platform for encouraging ethics, innovation and competition in healthcare. In addition, the Company’s Executive Vice President (EVP), Chief Financial Officer (CFO) serves as the Treasurer of the Masimo Foundation and the Company’s EVP, General Counsel and Corporate Secretary serves as the Secretary for the Masimo Foundation. During the three months ended July 3, 2021 and June 27, 2020, the Company made no cash contributions to the Masimo Foundation. During the six months ended July 3, 2021, the Company made no contributions to the Masimo Foundation. During the six months ended June 27, 2020, the Company made cash contributions of approximately $1.5 million to the Masimo Foundation. During the three and six months ended July 3, 2021 and June 27, 2020, the Company made various in-kind contributions to the Masimo Foundation, mainly in the form of donated administrative services. The Company’s CEO is also a co-founder and a member of the board of directors of Like Minded Media Ventures (LMMV), a team of storytellers that create content focused in the areas of true stories, social causes and science. LMMV creates stories with a multi-platform strategy, bridging the gap between film, television, digital and social media. The Company entered into a marketing service agreement with LMMV for audiovisual production services promoting brand awareness, including television commercials and digital advertising, during the second quarter of 2020. During the three and six months ended July 3, 2021, the Company incurred no marketing expenses to LMMV under the marketing service agreement. During the three and six months ended June 27, 2020, the Company incurred $3.3 million in marketing expenses to LMMV under the marketing service agreement. At July 3, 2021 and January 2, 2021, there was no amount due to LMMV for services rendered. The Company entered into a software license and professional services agreement with Like Minded Labs (LML), a subsidiary of LMMV, during the second quarter of 2021. Pursuant to the software license agreement, LML granted the Company a perpetual, non-exclusive and fully paid-up right and license to integrate LML’s software into the Company’s products in exchange for a $3.0 million one-time license fee. Pursuant to the professional services agreement, LML will provide professional services to the Company, including the development of custom software intended to support the integration of the licensed software into the Company’s products, as well as future support services upon the Company’s acceptance of deliverables. In July 2021, the Company entered into a patent purchase and option agreement with Vantrix Corporation (Vantrix), an acquiree of LML, for certain patents for $0.5 million, and the right to purchase two pools of additional patents from Vantrix for an exercise fee of up to $1.1 million. The agreements with LML and Vantrix include sublicensing provisions whereby the software and patents are licensed back to LML or Vantrix, respectively, for further advancement of the technologies. The Company maintains an aircraft time share agreement, pursuant to which the Company has agreed from time to time to make its aircraft available to the Company’s CEO for lease on a time-sharing basis. The Company charges the Company’s CEO for personal use based on agreed upon reimbursement rates. For each of the three and six months ended July 3, 2021 and June 27, 2020, the Company charged the Company’s CEO less than $0.1 million related to such disbursements.
Cercacor Laboratories
Related Party Transaction [Line Items]
Payments for Royalties		$ 3,200,000	$ 3,100,000	$ 6,700,000	$ 6,200,000
Payment for Administrative Fees		100,000	100,000	$ 100,000	200,000
Related Party Transaction, Date				Dec. 31, 2024
Operating Leases, Income Statement, Sublease Revenue		300,000	300,000	$ 600,000	500,000
Related Party Transaction, Due from (to) Related Party		(3,100,000)		$ (3,100,000)		$ (3,600,000)
Leased Property
Related Party Transaction [Line Items]
Property Plant and Equipment, Occupied Square Feet | ft²				34,000
Subleased Property
Related Party Transaction [Line Items]
Property Plant and Equipment, Occupied Square Feet | ft²				16,830
Not for Profit Organization
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction		0		$ 0	1,500,000
Like Minded Media Ventures
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party		0		0		$ 0
Related Party Transaction, Expenses from Transactions with Related Party		0	3,300,000	0	$ 3,300,000
Reimbursement Fee
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party		100,000	$ 100,000
Like Minded Labs
Related Party Transaction [Line Items]
Finite-Lived License Agreements, Gross		$ 3,000,000.0		3,000,000.0
Vantrix Corp | Subsequent Event | Purchase Commitment
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 500,000
Vantrix Corp | Subsequent Event | Options Held
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 1,100,000
Minimum
Related Party Transaction [Line Items]
Payments for Royalties				$ 5,000,000.0

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