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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - Senior Notes - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Debt Instrument [Line Items] |  |  |
Interest expense | $ 54.2 | $ 62.7 | $ 62.7
Non-cash interest expense | 2.9 | 2.8 | 2.8
2028 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 19.2 | 19.2 | 19.2
Non-cash interest expense | $ 0.7 | 0.7 | 0.7
Interest rate (percent) | 4.625% |  |
2025 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | $ 2.3 | 43.5 | 43.5
Non-cash interest expense | $ 0.1 | 2.1 | 2.1
Interest rate (percent) | 4.375% |  |
2029 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | $ 32.7 | 0.0 | 0.0
Non-cash interest expense | $ 2.1 | $ 0.0 | $ 0.0
Interest rate (percent) | 3.25% |  |

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