v3.26.1
Fresh Start Accounting - Fair Value Adjustment of Property and Equipment Due to the Adoption of Fresh Start Accounting (Details) - USD ($)
$ in Millions
Jun. 28, 2026
Sep. 29, 2025
Jun. 29, 2025
Reorganization, Chapter 11 [Line Items]      
Finance lease assets $ 2.1   $ 8.3
Property and equipment, net $ 691.4 $ 769.2 $ 3,916.5
Machinery and equipment | Minimum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years) 3 years    
Machinery and equipment | Maximum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years) 10 years    
Furniture and fixtures      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years) 5 years    
Vehicles      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years) 5 years    
Tooling | Minimum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years) 5 years    
Tooling | Maximum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years) 10 years    
Fresh-Start Adjustments      
Reorganization, Chapter 11 [Line Items]      
Finance lease assets   (5.6)  
Property and equipment, net   (3,006.6)  
Fresh-Start Adjustments | Land      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   14.7  
Fresh-Start Adjustments | Building      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   $ (1,195.7)  
Fresh-Start Adjustments | Building | Minimum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years)   5 years  
Fresh-Start Adjustments | Building | Maximum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years)   40 years  
Fresh-Start Adjustments | Machinery and equipment      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   $ (537.1)  
Fresh-Start Adjustments | Machinery and equipment | Minimum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years)   3 years  
Fresh-Start Adjustments | Machinery and equipment | Maximum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years)   10 years  
Fresh-Start Adjustments | Leasehold improvements and other      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   $ (91.7)  
Fresh-Start Adjustments | Furniture and fixtures      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   $ (2.3)  
Estimated Useful Life (in Years)   5 years  
Fresh-Start Adjustments | Computer hardware/software      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   $ (35.7)  
Fresh-Start Adjustments | Computer hardware/software | Minimum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years)   3 years  
Fresh-Start Adjustments | Computer hardware/software | Maximum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years)   10 years  
Fresh-Start Adjustments | Vehicles      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   $ 0.0  
Estimated Useful Life (in Years)   5 years  
Fresh-Start Adjustments | Tooling      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   $ (5.2)  
Fresh-Start Adjustments | Tooling | Minimum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years)   3 years  
Fresh-Start Adjustments | Tooling | Maximum      
Reorganization, Chapter 11 [Line Items]      
Estimated Useful Life (in Years)   10 years  
Fresh-Start Adjustments | Construction in progress      
Reorganization, Chapter 11 [Line Items]      
Property and equipment gross   $ (1,148.0)