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Restructuring - Schedule of Restructuring Exit And Disposal Costs Associated with the Operational Plan (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2025	Sep. 28, 2025	Jun. 28, 2026	Jun. 28, 2026	Jun. 29, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenue, net, Restructuring and other expenses			Cost of revenue, net, Restructuring and other expenses	Cost of revenue, net, Restructuring and other expenses
2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 2.4	$ 1.6		$ 91.5
Impairments on abandoned assets	$ 0.1			$ 1.8	170.2
Total	21.8			32.5	402.2
2026 Restructuring Plan, Second Quarter Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			7.5
2026 Restructuring Plan, Fourth Quarter Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			3.0
Inventory write-down/scrap \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.5			11.7	0.0
Severance \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1	0.1	0.0	0.0	72.9
Severance \| 2026 Restructuring Plan, Second Quarter Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			7.5	7.5
Severance \| 2026 Restructuring Plan, Fourth Quarter Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges			3.0	3.0
Contract termination costs \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.3	$ 2.3	$ 1.6	1.6	18.6
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 18.1			$ 26.2	$ 97.1
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenue, net, Restructuring and other expenses			Cost of revenue, net, Restructuring and other expenses	Cost of revenue, net, Restructuring and other expenses
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold \| Accelerated depreciation \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5.6			$ 0.0	$ 33.6
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold \| Other closure-related costs \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	10.0			14.5	63.5
Income Statement Location [Axis]: wolf:RestructuringAndOtherOperatingExpense \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3.7			$ 6.3	$ 305.1
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenue, net, Restructuring and other expenses			Cost of revenue, net, Restructuring and other expenses	Cost of revenue, net, Restructuring and other expenses
Income Statement Location [Axis]: wolf:RestructuringAndOtherOperatingExpense \| 2026 Restructuring Plan, Second Quarter Reduction
Restructuring Cost and Reserve [Line Items]
Total				$ 7.5
Income Statement Location [Axis]: wolf:RestructuringAndOtherOperatingExpense \| 2026 Restructuring Plan, Fourth Quarter Reduction
Restructuring Cost and Reserve [Line Items]
Total				3.0
Income Statement Location [Axis]: wolf:RestructuringAndOtherOperatingExpense \| Accelerated depreciation \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0			0.0	$ 11.4
Income Statement Location [Axis]: wolf:RestructuringAndOtherOperatingExpense \| Other closure-related costs \| 2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.2			$ 2.9	$ 32.0