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Borrowings and Credit Arrangements - Interest Expense Credit Agreement (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
2018 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest expense | $ 22.0 |  |  |
Non-cash interest expense | $ 2.5 |  |  |
Weighted average interest rate | 1.13% |  |  |
Interest rate at end of period | 1.08% |  |  |
2017 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest expense |  | $ 46.6 |  |
Non-cash interest expense |  | $ 2.5 |  |
Weighted average interest rate |  | 2.25% |  |
Interest rate at end of period |  | 1.40% |  |
Prior Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest expense |  |  | $ 67.0 |
Non-cash interest expense |  |  | $ 2.6 |
Weighted average interest rate |  |  | 3.79% |
Interest rate at end of period |  |  |  | 3.43%

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