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Income Taxes - Schedule of Income Tax Expense in Consolidated Statements of Earnings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2025 | Sep. 27, 2024 | Sep. 29, 2023
Income Tax Disclosure [Abstract] |  |  |
Statutory amount | $ 114,130 | $ 163,230 | $ 109,405
State taxes, net of the federal benefit | 15,852 | 21,615 | 13,938
Exclusion of tax on non-controlling interests | (880) | (5,230) | (5,461)
Foreign: |  |  |
Difference in tax rates of foreign operations | 11,458 | 17,891 | 4,583
Expense/(Benefit) from foreign valuation allowance change | 415 | (27,780) | (1,305)
U.S. tax cost of foreign operations | 76,014 | 72,887 | 68,662
Derecognition of deferred tax liabilities related to investment in Australian partnership | 0 | (61,614) | 0
Other Includable Income | 1,344 | 25,952 | 0
Tax differential on foreign earnings | 89,231 | 27,336 | 71,940
Foreign tax credits | (48,885) | (33,402) | (36,180)
Tax Rate Change | 98 | (147) | (9,913)
Valuation allowance | 988 | 12,339 | (7,169)
Uncertain tax positions | 11,153 | (1,153) | (38,844)
Other items: |  |  |
Disallowed officer compensation | 5,157 | 5,394 | 7,081
Research and Development Credit | (35,637) | (17,110) | (2,133)
Stock compensation | 18,376 | 3,296 | 162
Transaction Costs | 675 | 8,500 | 4
Non-taxable mark-to-market Adjustment for Amentum investment | 51,989 | (39,255) | 0
Other items – net | (6,692) | (13,920) | (1,494)
Total other items | 33,868 | (53,095) | 3,620
Consolidated income tax expense from continuing operations | $ 215,555 | $ 131,493 | $ 101,336
Statutory tax rate | 21.00% | 21.00% | 21.00%
State taxes, net of the federal benefit | 2.90% | 2.80% | 2.70%
Exclusion of tax on non-controlling interests | (0.20%) | (0.70%) | (1.00%)
Foreign: |  |  |
Difference in tax rates of foreign operations | 2.10% | 2.30% | 0.90%
Expense/(Benefit) from foreign valuation allowance change | 0.10% | (3.60%) | (0.30%)
U.S. tax cost of foreign operations | 14.00% | 9.40% | 13.20%
Derecognition of deferred tax liabilities related to investment in Australian partnership | 0.00% | (7.90%) | 0.00%
Other Includable Income | 0.20% | 3.30% | 0.00%
Tax differential on foreign earnings | 16.40% | 3.50% | 13.80%
Foreign tax credits | (9.00%) | (4.30%) | (6.90%)
Tax Rate Change | 0.00% | 0.00% | (1.90%)
Valuation allowance | 0.20% | 1.60% | (1.40%)
Uncertain tax positions | 2.10% | (0.10%) | (7.50%)
Other items: |  |  |
Disallowed officer compensation | 0.90% | 0.70% | 1.40%
Research and Development Credit | (6.60%) | (2.20%) | (0.40%)
Stock compensation | 3.40% | 0.40% | 0.00%
Transaction Costs | 0.10% | 1.10% | 0.00%
Non-taxable mark-to-market Adjustment for Amentum investment | 9.60% | (5.10%) | 0.00%
Other items – net | (1.20%) | (1.80%) | (0.30%)
Total other items | 6.20% | (6.80%) | 0.70%
Income taxes from continuing operations (percent) | 39.70% | 16.90% | 19.50%

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