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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 26, 2022 | Mar. 27, 2021 | Mar. 26, 2022 | Mar. 27, 2021
Line of Credit Facility [Line Items] |  |  |  |
Interest expense | $ 13.0 | $ 13.1 | $ 26.0 | $ 28.2
Senior Notes | 2028 Senior Notes |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stated interest rate | 4.625% |  | 4.625% |
Interest expense | $ 4.8 | 4.8 | $ 9.6 | 9.6
Senior Notes | 2025 Senior Notes |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stated interest rate | 4.375% |  | 4.375% |
Interest expense | $ 0.0 | 0.0 | $ 0.0 | 2.3
Senior Notes | 2029 Senior Notes |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stated interest rate | 3.25% |  | 3.25% |
Interest expense | $ 8.2 | $ 8.3 | $ 16.4 | $ 16.3

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