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Schedule of Fair Value of Assets and Liabilities (Parenthetical) (Detail) - Long-Term Debt | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 28, 2025 | Dec. 28, 2024
Carrying Amount | 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 | 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 | 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 | 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 | 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 | 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%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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