v3.25.4

Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 28, 2025	Dec. 22, 2025	Sep. 29, 2025	Dec. 28, 2025	Sep. 29, 2025	Dec. 28, 2025	Dec. 29, 2024	Jun. 29, 2025
Debt Instrument [Line Items]
Initial Principal	$ 2,090.6			$ 2,090.6		$ 2,090.6		$ 6,325.0
Repayment of principal						(164.8)		0.0
Conversion to common stock						(18.5)		0.0
Outstanding principal	1,907.3			1,907.3		1,907.3		6,658.2
Embedded derivative on New 2L Renesas Convertible Notes	103.5			103.5		103.5
Unamortized premium/discount	(47.1)			(47.1)		(47.1)		(120.2)
Ending Balance	1,963.7			1,963.7		1,963.7		6,538.0
Equity component	159.3			159.3		159.3		0.0
Fair Value	$ 1,984.1			1,984.1		$ 1,984.1		$ 2,647.3
Repayments of senior debt				0.0	$ 308.5		$ 0.0
Paid-in-kind interest on long-term debt				$ 10.8	$ 0.0		$ 5.9
Substantial premium on 2L Convertible Notes			$ 168.8
Additional Paid-in Capital
Debt Instrument [Line Items]
Substantial premium on 2L Convertible Notes			$ 168.8
Convertible Notes | 1.75% Convertible Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	1.75%			1.75%		1.75%		1.75%
Effective interest rate (as a percent)								2.20%
Initial Principal								$ 575.0
Repayment of principal								0.0
Conversion to common stock								0.0
Outstanding principal								575.0
Unamortized premium/discount								(2.0)
Ending Balance								573.0
Equity component								0.0
Fair Value								$ 145.2
Convertible Notes | 0.25% Convertible Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.25%			0.25%		0.25%		0.25%
Effective interest rate (as a percent)								0.60%
Initial Principal								$ 750.0
Repayment of principal								0.0
Conversion to common stock								0.0
Outstanding principal								750.0
Unamortized premium/discount								(7.9)
Ending Balance								742.1
Equity component								0.0
Fair Value								$ 186.6
Convertible Notes | 1.875% Convertible Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	1.875%			1.875%		1.875%		1.875%
Effective interest rate (as a percent)								2.10%
Initial Principal								$ 1,750.0
Repayment of principal								0.0
Conversion to common stock								0.0
Outstanding principal								1,750.0
Unamortized premium/discount								(20.7)
Ending Balance								1,729.3
Equity component								0.0
Fair Value								$ 450.6
Convertible Notes | New 2L Non-Renesas Convertible Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)			2.50%		2.50%
Effective interest rate (as a percent)	3.00%			3.00%		3.00%
Initial Principal	$ 331.4			$ 331.4		$ 331.4
Repayment of principal						0.0
Conversion to common stock	(18.5)					(18.5)
Outstanding principal	312.9			312.9		312.9
Embedded derivative on New 2L Renesas Convertible Notes	0.0			0.0		0.0
Unamortized premium/discount	(7.2)			(7.2)		(7.2)
Ending Balance	305.7			305.7		305.7
Equity component	159.3			159.3		159.3
Fair Value	$ 493.6			$ 493.6		$ 493.6
Debt instrument, convertible, conversion price (in USD per share)			$ 12.23		$ 12.23
Debt conversion, converted instrument, shares issued (in shares)	1,500,000
Convertible Notes | New 2L Renesas Convertible Notes(5)
Debt Instrument [Line Items]
Stated interest rate (as a percent)			2.50%		2.50%
Effective interest rate (as a percent)	12.30%			12.30%		12.30%
Initial Principal	$ 203.6			$ 203.6		$ 203.6
Repayment of principal						0.0
Conversion to common stock						0.0
Outstanding principal	203.6			203.6		203.6
Embedded derivative on New 2L Renesas Convertible Notes	103.5			103.5		103.5
Unamortized premium/discount	(79.3)			(79.3)		(79.3)
Ending Balance	227.8			227.8		227.8
Equity component	0.0			0.0		0.0
Fair Value	$ 215.8			$ 215.8		$ 215.8
Debt instrument, convertible, conversion price (in USD per share)			$ 18.35		$ 18.35
Convertible Notes | 2L Convertible Notes
Debt Instrument [Line Items]
Percentage of equity component not related to outstanding debt due to conversions	5.60%			5.60%		5.60%
Senior Notes | 2030 Senior Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)								16.30%
Initial Principal								$ 1,250.0
Repayment of principal								0.0
Conversion to common stock								0.0
Outstanding principal								1,521.2
Unamortized premium/discount								(52.3)
Ending Balance								1,468.9
Equity component								0.0
Fair Value								$ 1,308.2
Senior Notes | New Senior Secured Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	12.90%			12.90%		12.90%
Initial Principal	$ 1,259.2			$ 1,259.2		$ 1,259.2
Repayment of principal						(164.8)
Conversion to common stock						0.0
Outstanding principal	1,094.4			1,094.4		1,094.4
Embedded derivative on New 2L Renesas Convertible Notes	0.0			0.0		0.0
Unamortized premium/discount	104.2			104.2		104.2
Ending Balance	1,198.6			1,198.6		1,198.6
Equity component	0.0			0.0		0.0
Fair Value	$ 1,034.2			$ 1,034.2		$ 1,034.2
Debt instrument, repurchased face amount		$ 175.0
Repayments of senior debt		197.9
Paid-in-kind interest on long-term debt		$ 10.2
Senior Notes | New 2L Non-Convertible Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	12.50%		7.00%	12.50%	7.00%	12.50%
Initial Principal	$ 296.4			$ 296.4		$ 296.4
Repayment of principal						0.0
Conversion to common stock						0.0
Outstanding principal	296.4			296.4		296.4
Embedded derivative on New 2L Renesas Convertible Notes	0.0			0.0		0.0
Unamortized premium/discount	(64.8)			(64.8)		(64.8)
Ending Balance	231.6			231.6		231.6
Equity component	0.0			0.0		0.0
Fair Value	$ 240.5			$ 240.5		$ 240.5
Unsecured Debt | CRD Agreement Deposits
Debt Instrument [Line Items]
Effective interest rate (as a percent)								6.80%
Initial Principal								$ 2,000.0
Repayment of principal								0.0
Conversion to common stock								0.0
Outstanding principal								2,062.0
Unamortized premium/discount								(37.3)
Ending Balance								2,024.7
Equity component								0.0
Fair Value								$ 556.7

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Amount of increase (decrease) in additional paid-in capital (APIC) from recognition of substantial premium at which convertible debt instrument is issued.

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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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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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