v3.25.4

Emergence from Voluntary Reorganization under Chapter 11 - Narrative (Details)		3 Months Ended		6 Months Ended
	Sep. 29, 2025 USD ($) plan day $ / shares shares	Dec. 28, 2025 USD ($) $ / shares shares	Sep. 29, 2025 USD ($) plan $ / shares shares	Dec. 29, 2024 USD ($)	Sep. 28, 2025 $ / shares shares	Aug. 14, 2025 USD ($)	Jun. 29, 2025 $ / shares shares
Reorganization, Chapter 11 [Line Items]
Common stock outstanding (in shares) | shares		27,365,000			156,479,390		155,643,000
Common stock, par value (in USD per share) | $ / shares	$ 0.00125	$ 0.00125	$ 0.00125		$ 0.00125		$ 0.00125
Common stock authorized (in shares) | shares	350,000,000	350,000,000	350,000,000				400,000,000
Common stock issued (in shares) | shares		27,365,000					155,643,000
Proceeds from issuance of 2L Convertible Notes through the rights offering	$ 275,000,000.0	$ 0	$ 275,000,000.0	$ 0
Number of equity compensation plans | plan	2		2
Long-Term Incentive Plan | New Common Stock For Fiscal Year 2026
Reorganization, Chapter 11 [Line Items]
Capital shares reserved for future issuance, value	$ 26,600,000
Long-Term Incentive Plan | New Common Stock For Fiscal Year 2027
Reorganization, Chapter 11 [Line Items]
Capital shares reserved for future issuance, value	$ 27,500,000
Renesas Warrant
Reorganization, Chapter 11 [Line Items]
Number of securities called by warrants (in shares) | shares	4,943,555		4,943,555
Warrant exercise price (USD per share) | $ / shares	$ 23.95		$ 23.95
Warrant term	3 years		3 years
Scenario 1
Reorganization, Chapter 11 [Line Items]
Regulatory trigger deadline, period following effective date	2 years
Scenario 2
Reorganization, Chapter 11 [Line Items]
Regulatory trigger deadline, period following effective date	3 years
New Common Stock
Reorganization, Chapter 11 [Line Items]
Issuance of new shares (in shares) | shares	25,840,656
Common stock outstanding (in shares) | shares	25,840,656		25,840,656
Common stock issued (in shares) | shares	25,840,656		25,840,656
Shares reserved for future issuance (in shares) | shares	73,030,424		73,030,424
New Common Stock | Long-Term Incentive Plan
Reorganization, Chapter 11 [Line Items]
Shares reserved for future issuance (in shares) | shares	4,058,925		4,058,925
New Common Stock | Management Incentive Plan
Reorganization, Chapter 11 [Line Items]
Shares reserved for future issuance (in shares) | shares	8,117,851		8,117,851
CRD Agreement Deposits | Unsecured Debt
Reorganization, Chapter 11 [Line Items]
Effective interest rate (as a percent)							6.80%
New Senior Secured Notes | Senior Notes
Reorganization, Chapter 11 [Line Items]
Aggregate principal amount	$ 1,300,000,000		$ 1,300,000,000
Effective interest rate (as a percent)		12.90%
Debt instrument, percentage of net proceeds from extraordinary receipts, offer to repurchase debt	100.00%		100.00%
Redemption price, extraordinary receipts, percentage	109.875%
Debt instrument, percentage of net proceeds from non-ordinary asset sales and casualty events, offer to repurchase debt	100.00%		100.00%
Redemption, make whole redemption price minus percentage of principal amount, percentage	1.00%
Optional redemption, percentage	35.00%
Optional redemption, required proceeds from equity issuance	$ 300,000,000
Optional redemption price, percentage	111.875%
Perfected first lien security interest, minimum	$ 350,000,000		$ 350,000,000
New Senior Secured Notes | Senior Notes | Debt Instrument, Redemption, Period One
Reorganization, Chapter 11 [Line Items]
Debt instrument, excess of extraordinary principal amount	200,000,000
Repurchase amount	$ 175,000,000		175,000,000
Redemption price, non-ordinary asset sales and casualty events, percentage	111.875%
New Senior Secured Notes | Senior Notes | Debt Instrument, Redemption, Period Two
Reorganization, Chapter 11 [Line Items]
Debt instrument, excess of extraordinary principal amount	$ 200,000,000
Repurchase amount	$ 225,000,000		225,000,000
Redemption price, non-ordinary asset sales and casualty events, percentage	109.875%
New Senior Secured Notes | Senior Notes | Debt Instrument, Redemption, Period Three
Reorganization, Chapter 11 [Line Items]
Debt instrument, excess of extraordinary principal amount	$ 200,000,000
Repurchase amount	$ 150,000,000		150,000,000
Redemption price, non-ordinary asset sales and casualty events, percentage	105.00%
New Senior Secured Notes | Senior Notes | Debt Instrument, Redemption, Period Four
Reorganization, Chapter 11 [Line Items]
Redemption price, non-ordinary asset sales and casualty events, percentage	103.00%
New Senior Secured Notes | Senior Notes | Debt Instrument, Redemption, Period Five
Reorganization, Chapter 11 [Line Items]
Redemption price, non-ordinary asset sales and casualty events, percentage	100.00%
New Senior Secured Notes | Senior Notes | Interest Rate Step-Down Condition, Met
Reorganization, Chapter 11 [Line Items]
Interest rate step-down condition met, amount redeemed or reimbursed	$ 1,000,000,000		$ 1,000,000,000
Interest rate step-down condition met, award disbursements received	$ 450,000,000
Debt instrument, covenant, outstanding principal amount to EBITDA, maximum	2.00
New Senior Secured Notes | Senior Notes | Interest Period One
Reorganization, Chapter 11 [Line Items]
Stated interest rate (as a percent)	9.875%		9.875%
New Senior Secured Notes | Senior Notes | Interest Period Two | Interest Rate Step-Down Condition, Met
Reorganization, Chapter 11 [Line Items]
Stated interest rate (as a percent)	13.875%		13.875%
New Senior Secured Notes | Senior Notes | Interest Period Two | Interest Rate Step-Down Condition, Not Met
Reorganization, Chapter 11 [Line Items]
Stated interest rate (as a percent)	15.875%		15.875%
New Senior Secured Notes | Payment in Kind (PIK) Note | Interest Period One
Reorganization, Chapter 11 [Line Items]
Stated interest rate (as a percent)	4.00%		4.00%
Existing Senior Secured Notes | Senior Notes
Reorganization, Chapter 11 [Line Items]
Redemption principal amount	$ 277,500,000		$ 277,500,000
Redemption percentage of principal amount redeemed	109.875%
1.75%, 0.25% and 1.875% Convertible Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Debt instrument, discharged and terminated	$ 3,100,000,000		3,100,000,000
New 2L Non-Renesas Convertible Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Aggregate principal amount	$ 301,100,000		$ 301,100,000
Redemption price (as a percent)	91.3242%
Proceeds from issuance of 2L Convertible Notes through the rights offering	$ 275,000,000
Effective interest rate (as a percent)		3.00%
Stated interest rate (as a percent)	2.50%		2.50%
Debt instrument, convertible until period after maturity date | day	5
Debt instrument, redemption price, not permitted to be redeemed, period following effective date	3 years
Backstop Premium | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Aggregate principal amount	$ 331,400,000		$ 331,400,000			$ 30,250,000
Payment of the backstop premium	30,300,000
New 2L Non-Convertible Notes | Senior Notes
Reorganization, Chapter 11 [Line Items]
Aggregate principal amount	$ 296,400,000		$ 296,400,000
Effective interest rate (as a percent)	7.00%	12.50%	7.00%
Debt instrument, redemption price, not permitted to be redeemed, period following effective date	2 years
Required redemption price, percentage	101.00%
New 2L Non-Convertible Notes | Payment in Kind (PIK) Note
Reorganization, Chapter 11 [Line Items]
Effective interest rate (as a percent)	12.00%		12.00%
New 2L Non-Convertible Notes | Notes Payable, Other Payables
Reorganization, Chapter 11 [Line Items]
Effective interest rate (as a percent)	7.00%		7.00%
2L Convertible Notes | New Common Stock
Reorganization, Chapter 11 [Line Items]
Issuance of new shares (in shares) | shares	24,533,760
2L Convertible Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Aggregate principal amount						301,130,000
Required redemption price, percentage	100.00%
New 2L Renesas Convertible Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Aggregate principal amount						$ 203,600,000
Effective interest rate (as a percent)		12.30%
Stated interest rate (as a percent)	2.50%		2.50%
Debt instrument, redemption price, not permitted to be redeemed, period following effective date	2 years
New 2L Notes | Convertible Notes
Reorganization, Chapter 11 [Line Items]
Entitled redemption price, percentage of principal amount redeemed, optional redemption	100.00%
Convertible Second-Lien Senior Secured Notes Due 2031 | Senior Notes
Reorganization, Chapter 11 [Line Items]
Stated interest rate (as a percent)	2.50%		2.50%			2.50%
Renesas
Reorganization, Chapter 11 [Line Items]
Investor rights and disposition agreement, percentage of new common stock held	10.00%
Investor rights and disposition agreement, cannot exercise voting rights, percentage of aggregate company voting power	9.90%
Investor rights and disposition agreement, percentage of aggregate company voting power, after conversion	39.90%
Renesas | Scenario 1
Reorganization, Chapter 11 [Line Items]
Regulatory approvals, debtor notification, period following effective date	30 days
Renesas | Scenario 2
Reorganization, Chapter 11 [Line Items]
Regulatory approvals, debtor notification, period following effective date	30 days
Renesas | Approvals Obtained
Reorganization, Chapter 11 [Line Items]
Restructuring support agreement, cash remitted or retained by company	$ 10,000,000		$ 10,000,000
Restructuring support agreement, new common stock distributed to holders of old common stock (in shares) | shares	871,287		871,287
Renesas | New Common Stock
Reorganization, Chapter 11 [Line Items]
Issuance of new shares (in shares) | shares	16,852,372
Pro rata portion of shares issued if regulatory approvals received (in shares) | shares	871,287		871,287
Shares issued if regulatory approvals received (in shares) | shares	16,852,372		16,852,372
Renesas | CRD Agreement Deposits | Unsecured Debt
Reorganization, Chapter 11 [Line Items]
Aggregate principal amount	$ 2,100,000,000		$ 2,100,000,000
Debt instrument, discharged and terminated	2,100,000,000		2,100,000,000
Renesas | New Senior Secured Notes | Senior Notes | Approvals Obtained
Reorganization, Chapter 11 [Line Items]
Restructuring support agreement, reserve cash remitted to debt holders	$ 5,000,000		$ 5,000,000
Existing Equity Holders | New Common Stock
Reorganization, Chapter 11 [Line Items]
Issuance of new shares (in shares) | shares	1,306,896

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