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Commitments and Contingencies (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 08, 2025
lawsuit
Jun. 28, 2020
endowedFacultyChair
Jun. 29, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 25, 2023
USD ($)
Loss Contingencies [Line Items]            
Loss contingency, number of additional lawsuits | lawsuit 2          
Government assistance, award amount     $ 500.0      
Government assistance, transaction duration   13 years        
Duration of annual commitment fee payment of GDA   6 years        
Number of endowed faculty chairs created | endowedFacultyChair   2        
Reduction in property, plant, and equipment     500.0      
Government assistance, cumulative amount received     $ 467.3      
Government Assistance, Asset, Statement of Financial Position [Extensible Enumeration]     Cash and Cash Equivalent      
Grants receivable, current     $ 32.7      
Purchase Commitment 2023            
Loss Contingencies [Line Items]            
Purchase commitment, amount committed         $ 86.4 $ 200.0
Current purchases under agreement     20.0 $ 36.7    
Product purchases year one     41.3      
Product purchases year two     38.0      
Product purchases year three     40.0      
Product purchases year four     42.0      
Purchase Commitment            
Loss Contingencies [Line Items]            
Capacity reserve deposit     60.0      
Capacity reserve payment     18.1 32.9   $ 5.5
Purchase Commitment 2024            
Loss Contingencies [Line Items]            
Current purchases under agreement     26.4 $ 19.2    
Product purchases year one     31.2      
Product purchases year two     9.6      
Electricity for Siler City, North Carolina Facilities            
Loss Contingencies [Line Items]            
Purchase commitment, amount committed     $ 62.4      
Purchase commitment, period     5 years      
Electricity for Durham, North Carolina Facilities            
Loss Contingencies [Line Items]            
Purchase commitment, amount committed     $ 25.7      
Purchase commitment, period     8 years      
Minimum            
Loss Contingencies [Line Items]            
Annual cost of GDA     $ 2.2      
Maximum            
Loss Contingencies [Line Items]            
Annual cost of GDA     $ 5.2