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Employee Benefits (Details) $ in Millions	3 Months Ended
	Mar. 29, 2025 USD ($) plan	Mar. 30, 2024 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, number of plans | plan	1
Masimo Retirement Savings Plan
Defined Contribution Plan Disclosure [Line Items]
Percent of employees' gross pay	100.00%
Percent of match	3.00%
Company's contribution to employee retirement savings plan	$ 1.0	$ 1.1
Masimo Retirement Savings Plan | Foreign Plan
Defined Contribution Plan Disclosure [Line Items]
Company's contribution to employee retirement savings plan	$ 0.6	$ 0.5

X

- Definition

Defined Contribution Plan, Number Of Plans

+ References

No definition available.

+ Details

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Namespace Prefix:	masi_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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