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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-4

Fresh Start Accounting - Settlement of Liabilities Subject to Compromise (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 29, 2025	Sep. 29, 2025	Jun. 28, 2026	Jun. 29, 2025	Jun. 30, 2024
Reorganization, Chapter 11 [Line Items]
Liabilities subject to compromise	$ 0.0	$ 0.0
Reinstatement of short-term finance lease liabilities (see Adjustment 4)	(0.6)	(0.6)	$ (0.2)	$ (0.5)
Reinstatement of long-term finance lease liabilities (see Adjustment 4)	(1.9)	(1.9)	(1.9)	(8.4)
Issuance of debt			(2,469.6)	(6,325.0)
Fair value issuance of New 2L Non-Renesas Convertible Notes – substantial premium (see Adjustment 12)	(168.8)	(168.8)
Proceeds from the New 2L Non-Renesas Convertible Notes through the rights offering (see Adjustment 1)	275.0
Fair value of the Renesas Warrant (see Adjustment 5)	(33.6)	(33.6)
Implied value of forward equity contract (see Adjustment 5)	(371.1)	(371.1)
Distribution of Contingent Cash to non-consolidated escrow account (see Adjustment 1)	(10.0)
Gain on settlement of liabilities subject to compromise (See Adjustment 13)		3,751.8	0.0	$ 0.0	$ 0.0
Senior Notes \| New Senior Secured Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt			(1,259.2)
Senior Notes \| New 2L Non-Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt			(296.4)
Convertible Notes \| New 2L Non-Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt			(331.4)
Proceeds from the New 2L Non-Renesas Convertible Notes through the rights offering (see Adjustment 1)	275.0
Convertible Notes \| New 2L Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt			$ (203.6)
Predecessor
Reorganization, Chapter 11 [Line Items]
Liabilities subject to compromise	7,315.3	7,315.3
Reinstatement of short-term finance lease liabilities (see Adjustment 4)	0.0	0.0
Reinstatement of long-term finance lease liabilities (see Adjustment 4)	0.0	0.0
Fair value of the Renesas Warrant (see Adjustment 5)	0.0	0.0
Implied value of forward equity contract (see Adjustment 5)	0.0	0.0
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Liabilities subject to compromise	(7,315.3)	(7,315.3)
Reinstatement of short-term finance lease liabilities (see Adjustment 4)	(0.6)	(0.6)
Reinstatement of short-term operating lease liabilities and supply agreements (see Adjustment 6)	(26.1)	(26.1)
Reinstatement of long-term finance lease liabilities (see Adjustment 4)	(8.3)	(8.3)
Reinstatement of long-term operating lease liabilities and supply agreements (see Adjustment 9)	(199.0)	(199.0)
Distribution of proceeds to holders of Senior Secured Notes (see Adjustment 1)	(324.0)	(324.0)
Proceeds from the New 2L Non-Renesas Convertible Notes through the rights offering (see Adjustment 1)	275.0
Implied value of issuance of Wolfspeed, Inc. New Common Stock, to creditors (see Adjustment 12)	(540.3)
Fair value of the Renesas Warrant (see Adjustment 5)	(33.6)	(33.6)
Implied value of forward equity contract (see Adjustment 5)	(371.1)	(371.1)
Distribution of Contingent Cash to non-consolidated escrow account (see Adjustment 1)	(10.0)
Gain on settlement of liabilities subject to compromise (See Adjustment 13)	3,751.8
Reorganization Adjustments \| New 2L Non-Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(331.4)	(331.4)
Reorganization Adjustments \| New 2L Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(216.3)	(216.3)
Reorganization Adjustments \| Senior Notes \| New Senior Secured Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(1,379.4)	(1,379.4)
Reorganization Adjustments \| Senior Notes \| New 2L Non-Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(229.6)	(229.6)
Reorganization Adjustments \| Convertible Notes \| New 2L Non-Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	(331.4)	(331.4)
Fair value issuance of New 2L Non-Renesas Convertible Notes – substantial premium (see Adjustment 12)	(168.8)	(168.8)
Reorganization Adjustments \| Convertible Notes \| New 2L Renesas Convertible Notes
Reorganization, Chapter 11 [Line Items]
Issuance of debt	$ (216.3)	$ (216.3)