Line of Credit Facility, Accordion Feature, Increase Limit

No definition available.

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

- Definition

Line of Credit Facility, Maximum Sublimit

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ Details

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

- 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

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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+ Details

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

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=masi_JapaneseGovernmentLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=masi_JapaneseEquipmentLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ForeignLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=masi_JapaneseRevolvingLoanMember
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Balance Type:
Period Type:

- Details

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- Details

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Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=masi_InitialLendersMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Debt - Narrative (Details) ¥ in Millions, $ in Millions			1 Months Ended	12 Months Ended
Debt - Narrative (Details) ¥ in Millions, $ in Millions	Feb. 28, 2023 USD ($)	Apr. 11, 2022 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)	Feb. 28, 2023 JPY (¥)	Dec. 31, 2022 JPY (¥)	May 16, 2022 USD ($)	Apr. 10, 2022 USD ($)	May 31, 2021 USD ($)	May 31, 2021 JPY (¥)	Apr. 30, 2021 USD ($)	Apr. 30, 2021 JPY (¥)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 JPY (¥)	Mar. 31, 2020 JPY (¥)
New Credit Facility Agreement
Debt Instrument [Line Items]
Accordion feature, increase limit		$ 400.0
New Credit Facility Agreement \| Adjusted Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
New Credit Facility Agreement \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
New Credit Facility Agreement \| Adjusted Secured Overnight Financing Rate (SOFR), One-Month Interest Period
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
New Credit Facility Agreement \| Adjusted Secured Overnight Financing Rate (SOFR), Three-Month Interest Period
Debt Instrument [Line Items]
Basis spread on variable rate		0.15%
New Credit Facility Agreement \| Adjusted Secured Overnight Financing Rate (SOFR), Six-Month Interest Period
Debt Instrument [Line Items]
Basis spread on variable rate		0.25%
New Credit Facility Agreement \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage		0.15%
New Credit Facility Agreement \| Minimum \| Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
New Credit Facility Agreement \| Minimum \| Adjusted Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
New Credit Facility Agreement \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage		0.275%
New Credit Facility Agreement \| Maximum \| Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
New Credit Facility Agreement \| Maximum \| Adjusted Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Japanese Government Loans
Debt Instrument [Line Items]
Debt instrument face amount														$ 11.3	¥ 1,480.0
Average interest rate														1.33%	1.33%
Japanese Equipment Loans
Debt Instrument [Line Items]
Debt instrument face amount										$ 0.6	¥ 80.0	$ 1.1	¥ 150.0
Average interest rate										1.20%	1.20%	0.58%	0.58%
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum sublimit									$ 25.0
Foreign Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum sublimit									75.0
Revolving Credit Facility
Debt Instrument [Line Items]
Current borrowing capacity									150.0
Line of credit facility, maximum borrowing capacity									$ 550.0
Interest expense				$ 23.7	$ 0.0
Revolving Credit Facility \| New Credit Facility Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 500.0						$ 705.0
Accordion feature, increase limit								$ 205.0
Revolving Credit Facility \| Line of Credit \| Japanese Revolving Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 6.1													¥ 800.0
Debt issuance costs			$ 0.1													¥ 7.2
Basis spread on variable rate			0.50%
Line of credit current				$ 6.1			¥ 800.0
Revolving Credit Facility \| Line of Credit \| Japanese Revolving Loan \| Subsequent Event
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 22.9					¥ 3,000.0
Debt issuance costs	$ 0.2					¥ 22.0
Basis spread on variable rate	0.75%
Revolving Credit Facility \| Line of Credit \| Lenders
Debt Instrument [Line Items]
Debt issuance costs		0.1
Revolving Credit Facility \| Line of Credit \| Initial Lenders
Debt Instrument [Line Items]
Debt issuance costs		8.4
Unsecured Debt \| New Credit Facility Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		300.0
Letter of Credit \| New Credit Facility Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 50.0