Annual Base Salary

No definition available.

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

- Definition

Annual Target Long-Term Incentive Award

+ References

No definition available.

+ Details

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

- Definition

Bonus Base Salary Percentage

+ References

No definition available.

+ Details

Name:	masi_BonusBaseSalaryPercentage
Namespace Prefix:	masi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Continuous Employment Period

+ References

No definition available.

+ Details

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

- Definition

Discretionary Bonus Amount

+ References

No definition available.

+ Details

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

- Definition

Discretionary Bonus Of Target Amount

+ References

No definition available.

+ Details

Name:	masi_DiscretionaryBonusOfTargetAmount
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

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, Success Fee Payable

+ References

No definition available.

+ Details

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

- Definition

Loss Contingency, Success Fee, Payments

+ References

No definition available.

+ Details

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

- Definition

Percentage of Accounts Receivable Balance

+ References

No definition available.

+ Details

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

- Definition

Retirement Policy Attainment Period

+ References

No definition available.

+ Details

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

- 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

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

Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-4

+ Details

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

- 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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 20
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

+ 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

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

+ Details

Name:	us-gaap_LossContingencyDamagesSoughtValue
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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

+ 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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesMember
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_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
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_MajorCustomersAxis=masi_CustomerOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

Name:	srt_LitigationCaseAxis=masi_BrennanAgreementMember
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.WillowLaboratoriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Commitments and Contingencies (Details)									1 Months Ended			3 Months Ended
Commitments and Contingencies (Details)	Jun. 12, 2025 USD ($)	May 26, 2025 USD ($)	Jan. 17, 2025 USD ($)	Nov. 13, 2024 USD ($) shares	Jun. 05, 2023 USD ($)	Jan. 30, 2023 patent	Oct. 13, 2020 patent	Nov. 04, 2015 USD ($)	Nov. 30, 2025 USD ($)	Oct. 31, 2024 USD ($)	Feb. 28, 2023 patent	Apr. 04, 2026 USD ($) distributor shares	Mar. 29, 2025 distributor shares	Jan. 03, 2026 USD ($)	Dec. 28, 2024	Oct. 24, 2024 USD ($)	Oct. 20, 2022 complaint
Contingencies And Commitments [Line Items]
Required notice of resignation												6 months
License fee												$ 2,500,000
Change in control												15,000,000.0				$ 15,000,000.0
Additional change in control																$ 2,000,000.0
Remaining commitment												245,100,000
Other commitment												3,600,000
Loss contingency, success fee, payments	$ 2,800,000
Success fees outstanding												0
Cash and cash equivalents												124,600,000		$ 152,300,000
Bank balance covered by federal deposit insurance corporation limit												$ 4,600,000
Sales
Contingencies And Commitments [Line Items]
Distributors \| distributor												1	1
GPO Members \| Revenue Benchmark \| Customer Concentration Risk
Contingencies And Commitments [Line Items]
Concentration risk, percentage												54.40%	58.70%
Just in Time Distributor One \| Revenue Benchmark \| Customer Concentration Risk
Contingencies And Commitments [Line Items]
Concentration risk, percentage												20.00%	18.90%
Customer One \| Accounts Receivable \| Customer Concentration Risk
Contingencies And Commitments [Line Items]
Percentage of accounts receivable balance												22.30%			26.50%
Customer Two \| Accounts Receivable \| Customer Concentration Risk
Contingencies And Commitments [Line Items]
Percentage of accounts receivable balance															10.10%
Ms Catherine Szyman
Contingencies And Commitments [Line Items]
Annual base salary			$ 1,000,000
Annual target long-term incentive award			$ 7,000,000
Retirement policy attainment period			60 years
Continuous employment period			5 years
Ms Catherine Szyman \| Minimum
Contingencies And Commitments [Line Items]
Base salary percentage			100.00%
Ms Catherine Szyman \| Maximum
Contingencies And Commitments [Line Items]
Base salary percentage			200.00%
Restricted Stock Units (RSUs)
Contingencies And Commitments [Line Items]
Share-based compensation arrangement, grants in period (in shares) \| shares												300,000
Brennan Agreement
Contingencies And Commitments [Line Items]
Annual base salary				$ 1,042,000
Discretionary bonus of target amount				621,250
Discretionary bonus amount				$ 1,087,190
Brennan Agreement \| Restricted Stock Units (RSUs)
Contingencies And Commitments [Line Items]
Share-based compensation arrangement, grants in period (in shares) \| shares				8,916
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
Loss contingency, damages awarded, value									$ 634,000,000
Apple, Inc. Patent Infringement \| Pending Litigation
Contingencies And Commitments [Line Items]
Loss contingency, damages awarded, value										$ 250
Number of complaints \| complaint																	2
Masimo V.S. Willow Laboratories \| Pending Litigation
Contingencies And Commitments [Line Items]
Loss contingency, damages sought, value		$ 6,100,000
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 \| Restricted Stock Units (RSUs)
Contingencies And Commitments [Line Items]
Share-based compensation arrangement, grants in period (in shares) \| shares												2,700,000	2,700,000