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

The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities.

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Period Type:	instant

- Definition

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

+ References

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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Balance Type:	na
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.

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Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

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

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Balance Type:	debit
Period Type:	instant

- Definition

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

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Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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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.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- 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.

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Debt - Narrative (Details)			1 Months Ended		12 Months Ended
Debt - Narrative (Details)	Feb. 28, 2023 USD ($)	Apr. 11, 2022 USD ($)	Sep. 28, 2024 USD ($)	Mar. 31, 2020 USD ($)	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 JPY (¥)	Sep. 28, 2024 JPY (¥)	Feb. 28, 2023 JPY (¥)	May 16, 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		$ 400,000,000
Effective interest rate					5.90%
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 Revolving Loan
Debt Instrument [Line Items]
Effective interest rate					1.10%
Japanese Government Loans
Debt Instrument [Line Items]
Debt instrument face amount																	$ 9,400,000	¥ 1,480,000,000
Average interest rate																	1.33%	1.33%
Japanese Equipment Loans
Debt Instrument [Line Items]
Debt instrument face amount								$ 1,500,000	¥ 230,000,000				$ 500,000	¥ 80,000,000	$ 1,000,000	¥ 150,000,000
Average interest rate								1.095%	1.095%				1.20%	1.20%	0.58%	0.58%
Japanese Syndicate Loan
Debt Instrument [Line Items]
Debt issuance costs			$ 200,000							¥ 25,000,000
Debt instrument face amount			$ 7,900,000							¥ 1,250,000,000
Japanese Syndicate Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.70%
Unsecured Debt \| New Credit Facility Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 300,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Interest expense					$ 41,200,000	$ 47,000,000	$ 23,700,000
Revolving Credit Facility \| New Credit Facility Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		500,000,000										$ 705,000,000
Accordion feature, increase limit												$ 205,000,000
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Available borrowing capacity					245,500,000
Outstanding available letters of credit					$ 47,000,000
Revolving Credit Facility \| Line of Credit \| Japanese Revolving Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 19,000,000			$ 5,100,000							¥ 3,000,000,000								¥ 800,000,000
Debt issuance costs	$ 100,000			$ 100,000							¥ 22,000,000								¥ 7,200,000
Basis spread on variable rate	0.75%			0.50%
Collateralized assets				$ 7,600,000
Revolving Credit Facility \| Line of Credit \| Initial Lenders
Debt Instrument [Line Items]
Debt issuance costs		8,400,000
Letter of Credit \| New Credit Facility Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 50,000,000