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Restructuring and Other Charges - Schedule of Cumulative Amounts Incurred for Restructuring and Other Activities Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 26, 2025 | Sep. 27, 2024 | Sep. 27, 2024
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative amounts incurred to date | $ 270,328 |  |
Interest Rate Swap |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Derivative, gain on derivative | 35,200 | $ 35,200 | $ 35,200
Voluntary and Involuntary Terminations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative amounts incurred to date | 109,042 |  |
Outside Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative amounts incurred to date | 158,475 |  |
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative amounts incurred to date | $ 2,811 |  |

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