Coupon Interest

No definition available.

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

- Definition

Debt Conversion, Converted Instrument, Cash Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	mtsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Conversion, Converted Instrument, Fair Value

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Period Type:	duration

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

+ Details

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Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

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- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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- Definition

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

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- 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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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

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

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Debt - Additional Information (Details) $ / shares in Units, $ in Thousands				3 Months Ended			9 Months Ended
	Mar. 16, 2026 USD ($) shares	Dec. 19, 2024 USD ($) shares	Mar. 25, 2021 USD ($) tradingDay day $ / shares	Jul. 03, 2026 USD ($)	Jan. 02, 2026 USD ($) shares	Jul. 04, 2025 USD ($)	Jul. 03, 2026 USD ($)	Jul. 04, 2025 USD ($)	Apr. 03, 2026 USD ($)	Oct. 03, 2025 USD ($)	Apr. 06, 2021 USD ($)
Debt Instrument [Line Items]
Issuance of common stock for convertible note exchange							$ 0	$ 205,915
Loss on extinguishment of debt				$ 0		$ 0	0	193,098
Long-term debt, remaining balance				344,316			344,316			$ 505,467
Stock Issued							283,650	0
Less: Short-term debt				340,465			340,465			160,946
Convertible Notes Payable
Debt Instrument [Line Items]
Long-term debt, remaining balance										344,316
Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Coupon Interest				0		100	200	500
Convertible Senior Notes Due 2026 \| Convertible Notes Payable
Debt Instrument [Line Items]
Stated rate			0.25%
Principle amount			$ 400,000								$ 50,000
Issuance of common stock for convertible note exchange		$ 288,800
Debt Conversion, Converted Instrument, Shares Issued \| shares	1,259,111				2,610
Long-term debt, remaining balance				0		161,200	0	161,200		161,151
Debt Instrument, Convertible, Conversion Ratio			0.0121767
Redemption price percentage			100.00%
Interest expense debt				0		500	400	1,600
Long-Term Debt, Fair Value										251,600
Debt Instrument, Repurchase Amount	$ 160,700								$ 500
Stock Issued	$ 283,200				$ 500
Convertible Senior Notes Due 2026 \| Convertible Notes Payable \| Conversion Period One
Debt Instrument [Line Items]
Convertible threshold trading days \| tradingDay			20
Threshold consecutive trading days \| tradingDay			30
Convertible Senior Notes Due 2026 \| Convertible Notes Payable \| Conversion Price \| Conversion Period One
Debt Instrument [Line Items]
Convertible threshold percentage of stock price trigger			130.00%
2029 Convertible Notes
Debt Instrument [Line Items]
Interest expense debt				300		$ 300	800	$ 600
Long-Term Debt, Fair Value				791,900			791,900			$ 353,300
2029 Convertible Notes \| Convertible Notes Payable
Debt Instrument [Line Items]
Stated rate			0.00%
Principle amount		$ 257,700	$ 344,300
Debt Conversion, Converted Instrument, Shares Issued \| shares		1,582,958
Issuance of common stock for convertible note exchange		$ 205,900
Debt Conversion, Converted Instrument, Cash Amount		17,600
Loss on extinguishment of debt		$ (193,100)
Long-term debt, remaining balance				$ 344,316			$ 344,316
Debt Instrument, Convertible, Conversion Ratio		0.0057463
Conversion price (in USD per share) \| $ / shares			$ 174.03
2029 Convertible Notes \| Convertible Notes Payable \| Conversion Period One
Debt Instrument [Line Items]
Convertible threshold trading days \| tradingDay			20
Threshold consecutive trading days \| tradingDay			30
2029 Convertible Notes \| Convertible Notes Payable \| Conversion Period Two
Debt Instrument [Line Items]
Convertible threshold trading days \| day			5
Threshold consecutive trading days \| tradingDay			5
2029 Convertible Notes \| Convertible Notes Payable \| Conversion Price \| Conversion Period One
Debt Instrument [Line Items]
Convertible threshold percentage of stock price trigger			130.00%
2029 Convertible Notes \| Convertible Notes Payable \| Principal Trading Price \| Conversion Period Two
Debt Instrument [Line Items]
Convertible threshold percentage of stock price trigger			98.00%
Private Placement of 2029 Convertible Notes \| Convertible Notes Payable
Debt Instrument [Line Items]
Principle amount		$ 86,600