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Basis of Presentation and New Accounting Standards - Narrative (Details)				3 Months Ended		12 Months Ended
	Sep. 29, 2025 USD ($) plan $ / shares shares	Aug. 14, 2025 USD ($)	Jun. 12, 2025 USD ($)	Sep. 28, 2025 USD ($) property claim segment $ / shares shares	Sep. 29, 2024 USD ($)	Jun. 29, 2025 USD ($) property $ / shares shares	Jun. 22, 2025	Mar. 30, 2025 property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Common stock outstanding (in shares) | shares				156,479,390		155,643,000
Common stock, par value (USD per share) | $ / shares				$ 0.00125		$ 0.00125
Common stock authorized (in shares) | shares				400,000,000		400,000,000
Common stock issued (in shares) | shares						155,643,000
Reorganization mathematical midpoint value			$ 2,600,000,000
Reorganization value, methodology and assumptions, debt			1,500,000,000
Number of claims filed | claim				70
Bankruptcy claims amount of claims filed				$ 7,500,000
Number of reportable segments | segment				1
Inventory write-off				$ 29,000,000.0	$ 0
Assets held for sale				19,300,000		$ 24,400,000
Cash tax refunds						189,100,000
Interest income				2,600,000
Investment tax credit receivable				654,000,000		653,400,000
Long-term investment tax credit receivable				181,300,000		105,000,000.0
Investment tax credit, property, plant and equipment reduction				1,021,800,000
Increase (decrease) in investment tax credit receivable				50,700,000
Net unrealized income (loss) on available-for-sale securities				(3,000,000.0)		(3,800,000)
Unrealized loss on available-for-sale securities				2,400,000		$ 2,400,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reorganization value			2,350,000,000
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reorganization value			$ 2,850,000,000
Disposal Group, Held-for-Sale, Not Discontinued Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of properties held-for-sale | property						2		3
Disposal Group, Held-for-Sale, Not Discontinued Operations | Three Properties Located in Texas and North Carolina
Accounts, Notes, Loans and Financing Receivable [Line Items]
Assets held for sale				$ 19,300,000
Number of properties held-for-sale | property				1
Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Common stock authorized (in shares) | shares	350,000,000
Notice of additional approvals, period following effective date	30 days
Number of equity compensation plans | plan	2
Reduction of debt, percentage	70.00%
Subsequent Event | Long-Term Incentive Plan | New Common Stock For Fiscal Year 2026
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital shares reserved for future issuance, value	$ 26,600,000
Subsequent Event | Long-Term Incentive Plan | New Common Stock For Fiscal Year 2027
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital shares reserved for future issuance, value	$ 27,500,000
Subsequent Event | Scenario 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Regulatory trigger deadline, period following effective date	2 years
Subsequent Event | Scenario 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Regulatory trigger deadline, period following effective date	3 years
Subsequent Event | Renesas Warrant
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of securities called by warrants (in shares) | shares	4,943,555
Warrant exercise price (USD per share) | $ / shares	$ 23.95
Warrant term	3 years
Warrant, extension term	1 year
Warrant, protection period	2 years
Subsequent Event | New Common Stock
Accounts, Notes, Loans and Financing Receivable [Line Items]
Common stock outstanding (in shares) | shares	25,840,656
Common stock, par value (USD per share) | $ / shares	$ 0.00125
Issuance of new common stock (in shares) | shares	25,840,656
Common stock issued (in shares) | shares	25,840,656
Shares reserved for future issuance (in shares) | shares	73,030,424
Subsequent Event | New Common Stock | Long-Term Incentive Plan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Shares reserved for future issuance (in shares) | shares	4,058,925
Subsequent Event | New Common Stock | Management Incentive Plan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Shares reserved for future issuance (in shares) | shares	8,117,851
Subsequent Event | Existing Equity Holders | New Common Stock
Accounts, Notes, Loans and Financing Receivable [Line Items]
Issuance of new common stock (in shares) | shares	1,306,896
Subsequent Event | Renesas
Accounts, Notes, Loans and Financing Receivable [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%
Subsequent Event | Renesas | Approvals Not Obtained
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructuring support agreement, contingent consideration, cash	$ 15,000,000
Restructuring support agreement, contingent consideration, new common stock (in shares) | shares	871,287,000
Subsequent Event | Renesas | Approvals Obtained
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructuring support agreement, cash remitted or retained by company	$ 10,000,000
Restructuring support agreement, new common stock distributed to holders of old common stock (in shares) | shares	871,287,000
Subsequent Event | Renesas | Renesas Warrant | Approvals Not Obtained
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructuring support agreement, contingent consideration, warrant extension term	1 year
Subsequent Event | Renesas | New Common Stock
Accounts, Notes, Loans and Financing Receivable [Line Items]
Shares issued if regulatory approvals received (in shares) | shares	16,852,372
Pro rata portion of shares issued if regulatory approvals received (in shares) | shares	871,287
Shares issued if regulatory approvals not received (in shares) | shares	871,287
Convertible Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of debt held by key debtholders							67.00%
Senior Secured Notes Due 2030 | Senior Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of debt held by key debtholders							97.00%
Convertible Senior Notes Due 2026 | Senior Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)							1.75%
Convertible Senior Notes Due 2028 | Senior Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)							0.25%
Convertible Senior Notes Due 2029 | Senior Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)							1.875%
Convertible Second-Lien Senior Secured Notes Due 2031 | Senior Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)		2.50%
Backstop Premium | Convertible Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate principal amount		$ 30,250,000
Backstop Premium | Convertible Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payment of the backstop premium	$ 30,250,000
Senior Secured Notes | Convertible Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate principal amount	2,100,000,000
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate principal amount	$ 1,300,000,000
Debt instrument, percentage of net proceeds from extraordinary receipts, offer to repurchase debt	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%
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
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Debt Instrument, Redemption, Period One
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, excess of extraordinary principal amount	$ 200,000,000
Redemption price, non-ordinary asset sales and casualty events, percentage	111.875%
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Debt Instrument, Redemption, Period One | Forecast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Repurchase amount	$ 175,000,000
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Debt Instrument, Redemption, Period Two
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, excess of extraordinary principal amount	200,000,000
Repurchase amount	$ 225,000,000
Redemption price, non-ordinary asset sales and casualty events, percentage	109.875%
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Debt Instrument, Redemption, Period Three
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, excess of extraordinary principal amount	$ 200,000,000
Repurchase amount	$ 150,000,000
Redemption price, non-ordinary asset sales and casualty events, percentage	105.00%
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Debt Instrument, Redemption, Period Four
Accounts, Notes, Loans and Financing Receivable [Line Items]
Redemption price, non-ordinary asset sales and casualty events, percentage	103.00%
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Debt Instrument, Redemption, Period Five
Accounts, Notes, Loans and Financing Receivable [Line Items]
Redemption price, non-ordinary asset sales and casualty events, percentage	100.00%
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Interest Rate Step-Down Condition, Met
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest rate step-down condition met, amount redeemed or reimbursed	$ 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 Indenture | Senior Notes | Subsequent Event | Interest Period One
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)	9.875%
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Interest Period Two | Interest Rate Step-Down Condition, Met
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)	13.875%
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Interest Period Two | Interest Rate Step-Down Condition, Not Met
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)	15.875%
New Senior Secured Notes Indenture | Senior Notes | Subsequent Event | Renesas | Approvals Obtained
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructuring support agreement, reserve cash remitted to debt holders	$ 5,000,000
New Senior Secured Notes Indenture | Payment in Kind (PIK) Note | Subsequent Event | Interest Period One
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)	4.00%
Existing Senior Secured Notes | Senior Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Redemption principal amount	$ 277,500,000
Redemption percentage of principal amount redeemed	109.875%
Second Lien Secured Notes | Senior Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate principal amount	$ 296,400,000
Effective interest rate (as a percent)	7.00%
Second Lien Secured Notes | Payment in Kind (PIK) Note | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Effective interest rate (as a percent)	12.00%
New Renesas 2L Takeback Convertible Notes | Convertible Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)	2.50%
Aggregate principal amount	$ 203,600,000
New 2L Notes | Convertible Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Entitled redemption price, percentage of principal amount redeemed, optional redemption	100.00%
New 2L Convertible Notes | Convertible Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate principal amount		$ 301,130,000
Non-holdback rights offering, percentage		60.00%
Holdback rights offering, percentage		40.00%
New 2L Convertible Notes | Convertible Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate principal amount	$ 331,400,000
Required redemption price, percentage	100.00%
New 2L Non-Renesas Convertible Notes | Convertible Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, redemption price, not permitted to be redeemed, period following effective date	3 years
New 2L Renesas Convertible Notes | Convertible Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, redemption price, not permitted to be redeemed, period following effective date	2 years
New 2L Non-Convertible Notes | Senior Notes | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
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 | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Effective interest rate (as a percent)	12.00%
New 2L Non-Convertible Notes | Notes Payable, Other Payables | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Effective interest rate (as a percent)	7.00%
New 2L Non-Convertible Notes | Notes Payable, Other Payables | Subsequent Event | Renesas | Approvals Not Obtained
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructuring support agreement, contingent consideration, debt	$ 15,000,000

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