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Schedule of Fair Value of Assets and Liabilities (Parenthetical) (Detail)
12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
American & Foreign Power Company, Inc. 5% debentures, due 2030    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long term debt, interest rate 5.00% 5.00%
Carrying Amount | Long-Term Debt | New Facilities loans Under Third Amended Credit Agreement due 2025    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2025 2025
Carrying Amount | Long-Term Debt | Revolving Loan Facility loans under the Fourth Amended Credit Agreement, due 2029    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2029 2029
Carrying Amount | Long-Term Debt | Revenue bonds, due in varying amounts periodically through 2029    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2029 2029
Carrying Amount | Long-Term Debt | American & Foreign Power Company, Inc. 5% debentures, due 2030    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2030 2030
Long term debt, interest rate 5.00% 5.00%
Fair Value | Long-Term Debt | New Facilities loans Under Third Amended Credit Agreement due 2025    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2025 2025
Fair Value | Long-Term Debt | Revolving Loan Facility loans under the Fourth Amended Credit Agreement, due 2029    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2029 2029
Fair Value | Long-Term Debt | Revenue bonds, due in varying amounts periodically through 2029    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2029 2029
Fair Value | Long-Term Debt | American & Foreign Power Company, Inc. 5% debentures, due 2030    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, due date 2030 2030
Long term debt, interest rate 5.00% 5.00%