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Significant Accounting Policies (Details)
Mar. 02, 2021
Sep. 26, 2025
Sep. 27, 2024
PA Consulting Employees      
Significant Accounting Policies [Line Items]      
Ownership interest of employees 35.00% 71.00% 70.00%
Preferred stock cumulative dividend rate 12.00%    
Preferred stock redemption period 5 years    
Minimum      
Significant Accounting Policies [Line Items]      
Term of lease contract   1 year  
Maximum      
Significant Accounting Policies [Line Items]      
Term of lease contract   18 years  
Buildings      
Significant Accounting Policies [Line Items]      
Estimated useful life of assets   40 years  
Equipment | Minimum      
Significant Accounting Policies [Line Items]      
Estimated useful life of assets   3 years  
Equipment | Maximum      
Significant Accounting Policies [Line Items]      
Estimated useful life of assets   10 years  
Leasehold improvements | Minimum      
Significant Accounting Policies [Line Items]      
Estimated useful life of assets   1 year  
Leasehold improvements | Maximum      
Significant Accounting Policies [Line Items]      
Estimated useful life of assets   13 years