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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 27, 2026 | Mar. 28, 2025 | Mar. 27, 2026 | Mar. 28, 2025
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate (as a percent) | 34.50% | 90.60% | 37.10% | 98.90%
U.S tax unfavorable tax impacts | $ 13.0 |  | $ 7.5 |
State and local income taxes | $ 3.0 | $ 4.0 |  | $ 9.4
Nondeductible expense, investment loss |  | 33.1 |  | 70.1
Foreign income tax rate differential |  | $ 4.5 |  | $ 9.4
Non-deductible compensation related charge associated with the PA Consulting acquisition |  |  | $ 3.4 |

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