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Fair Value, Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($) $ in Millions | Dec. 27, 2024 | Sep. 27, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt under Senior Notes | $ 994.7 | $ 994.3
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt, fair value | 907.9 | 919.6
2026 Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes, noncurrent | 498.8 | 498.5
2026 Notes | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, fair value | 478.5 | 478.4
2031 Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes, noncurrent | 495.9 | 495.8
2031 Notes | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, fair value | $ 429.4 | $ 441.2

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