No definition available.

Name:	masi_BankBalances
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Concentration Risk, Just-In-Time Distributors

+ References

No definition available.

+ Details

Name:	masi_ConcentrationRiskJustInTimeDistributors
Namespace Prefix:	masi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Contingencies And Commitments [Line Items]

+ References

No definition available.

+ Details

Name:	masi_ContingenciesAndCommitmentsLineItems
Namespace Prefix:	masi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Employee Agreement, Severance Payment Period

+ References

No definition available.

+ Details

Name:	masi_EmployeeAgreementSeverancePaymentPeriod
Namespace Prefix:	masi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Employment Agreement, Cash Payment

+ References

No definition available.

+ Details

Name:	masi_EmploymentAgreementCashPayment
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Employment Agreement, Equity Awards, Value

+ References

No definition available.

+ Details

Name:	masi_EmploymentAgreementEquityAwardsValue
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination

+ References

No definition available.

+ Details

Name:	masi_EmploymentAgreementSeveranceBenefitsSpecialPaymentQualifyingTermination
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Employment Agreement, Severance Terms

+ References

No definition available.

+ Details

Name:	masi_EmploymentAgreementSeveranceTerms
Namespace Prefix:	masi_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Endorsement Agreement

+ References

No definition available.

+ Details

Name:	masi_EndorsementAgreement
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Endorsement Agreement Minimum Guaranteed Royalty Payment

+ References

No definition available.

+ Details

Name:	masi_EndorsementAgreementMinimumGuaranteedRoyaltyPayment
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Endorsement Agreement Term

+ References

No definition available.

+ Details

Name:	masi_EndorsementAgreementTerm
Namespace Prefix:	masi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

License Fee, Change In Control

+ References

No definition available.

+ Details

Name:	masi_LicenseFeeChangeInControl
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

License Fee, Change In Control, Amount Company Paid

+ References

No definition available.

+ Details

Name:	masi_LicenseFeeChangeInControlAmountCompanyPaid
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Loss Contingency, Number Of Complaints

+ References

No definition available.

+ Details

Name:	masi_LossContingencyNumberOfComplaints
Namespace Prefix:	masi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Loss Contingency, Percentage Outstanding Shares Of Defendants Formed Stockholder Group And Engaged In Short-Swing Trading

+ References

No definition available.

+ Details

Name:	masi_LossContingencyPercentageOutstandingSharesOfDefendantsFormedStockholderGroupAndEngagedInShortSwingTrading
Namespace Prefix:	masi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Endorsement Agreements

+ References

No definition available.

+ Details

Name:	masi_NumberOfEndorsementAgreements
Namespace Prefix:	masi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Principal Amount Of Endorsement Agreement

+ References

No definition available.

+ Details

Name:	masi_PrincipalAmountOfEndorsementAgreement
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Royalty Guarantees, Commitments, Additional, Change in Control

+ References

No definition available.

+ Details

Name:	masi_RoyaltyGuaranteesCommitmentsAdditionalChangeinControl
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Royalty Guarantees, Commitments, Change in Control

+ References

No definition available.

+ Details

Name:	masi_RoyaltyGuaranteesCommitmentsChangeinControl
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Severance plan participation agreements.

+ References

No definition available.

+ Details

Name:	masi_SeverancePlanParticipationAgreements
Namespace Prefix:	masi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation

+ References

No definition available.

+ Details

Name:	masi_SupplementalUnemploymentBenefitsSeveranceBenefitsRequiredNoticeofResignation
Namespace Prefix:	masi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-21

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-20

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of entity's patents that another entity was found to have infringed.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483049/450-30-50-1

+ Details

Name:	us-gaap_GainContingencyPatentsFoundInfringedUponNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of entity's patents that another entity was found not to have infringed.

+ References

+ Details

Name:	us-gaap_GainContingencyPatentsFoundNotInfringedUponNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of damages awarded to the plaintiff in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

+ Details

Name:	us-gaap_LossContingencyDamagesAwardedValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of another entity's patents that the entity was found to have infringed.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

+ Details

Name:	us-gaap_LossContingencyPatentsFoundInfringedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount the entity has committed to make for future royalty guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 928
-SubTopic 440
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477866/928-440-50-1

+ Details

Name:	us-gaap_RoyaltyGuaranteesCommitmentsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=masi_MasimoVsAppleIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=masi_AppleIncPatentInfringementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=masi_MasimoV.S.Mr.KianiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=masi_GPOMembersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=masi_JustintimedistributoroneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_CashDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies (Details)					1 Months Ended			3 Months Ended		9 Months Ended
Commitments and Contingencies (Details)	Jun. 05, 2023 USD ($)	Jan. 30, 2023 patent	Oct. 13, 2020 patent	Nov. 04, 2015 USD ($)	Oct. 31, 2024 USD ($)	Feb. 28, 2023 patent	Jul. 31, 2017	Sep. 28, 2024 USD ($) distributor executiveOfficer	Sep. 30, 2023 distributor	Sep. 28, 2024 USD ($) distributor executiveOfficer	Sep. 30, 2023 distributor	Oct. 25, 2024	Oct. 24, 2024 USD ($)	Apr. 12, 2024 USD ($) agreement	Oct. 20, 2022 complaint
Contingencies And Commitments [Line Items]
Severance plan participation agreements \| executiveOfficer								6		6
Required notice of resignation										6 months
Royalty obligation								$ 5,000,000		$ 5,000,000
License fee								2,500,000		2,500,000
Change in control								15,000,000		15,000,000
Royalty guarantees, commitments, additional, change in control								2,000,000		2,000,000
Remaining commitment								274,000,000.0		274,000,000.0
Other commitment								3,900,000		3,900,000
Number of endorsement agreements \| agreement														2
Principal amount of endorsement agreement														$ 11,500,000
Endorsement agreement minimum guaranteed royalty payment										500,000
Endorsement agreement outstanding obligation								7,800,000		7,800,000
Bank balances								158,500,000		158,500,000
Bank balance covered by federal deposit insurance corporation limit								$ 8,300,000		$ 8,300,000
Subsequent Event
Contingencies And Commitments [Line Items]
License fee paid													$ 2,500,000
Minimum
Contingencies And Commitments [Line Items]
Endorsement agreement term (in months)														18 months
Maximum
Contingencies And Commitments [Line Items]
Endorsement agreement term (in months)														36 months
Masimo Vs. Apple Inc
Contingencies And Commitments [Line Items]
Number of patents found infringed \| patent		1				2
Masimo Vs. Apple Inc \| Pending Litigation
Contingencies And Commitments [Line Items]
Asserted patents found valid \| patent			3
Asserted patents found invalid \| patent			9
Apple, Inc. Patent Infringement \| Pending Litigation
Contingencies And Commitments [Line Items]
Number of complaints \| complaint															2
Apple, Inc. Patent Infringement \| Pending Litigation \| Subsequent Event
Contingencies And Commitments [Line Items]
Loss contingency, damages awarded, value					$ 250
Masimo V.S. Mr. Kiani \| Pending Litigation \| Subsequent Event
Contingencies And Commitments [Line Items]
Percentage shares owned by defendants formed stockholder group and engaged in short-swing trading												19.00%
Revenue Benchmark
Contingencies And Commitments [Line Items]
Distributors \| distributor								1	1	1	1
GPO Members \| Revenue Benchmark \| Customer Concentration Risk
Contingencies And Commitments [Line Items]
Concentration risk, percentage								57.30%	50.50%	57.90%	52.90%
Just in time distributor one \| Revenue Benchmark \| Customer Concentration Risk
Contingencies And Commitments [Line Items]
Concentration risk, percentage								16.20%	10.70%	13.90%	10.40%
Chief Executive Officer
Contingencies And Commitments [Line Items]
Severance payment period				3 years
Equity awards				$ 2,700,000
Cash payment				$ 35,000,000
Qualifying termination	$ 479,700,000
Chief Executive Officer \| Cash Distribution
Contingencies And Commitments [Line Items]
Severance terms							50.00%
Chief Executive Officer \| Restricted Stock Units (RSUs)
Contingencies And Commitments [Line Items]
Severance terms							50.00%