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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - Senior Notes - USD ($) $ in Millions	12 Months Ended
	Sep. 24, 2022	Sep. 25, 2021	Sep. 26, 2020
Debt Instrument [Line Items]
Interest expense	$ 52.1	$ 54.2	$ 62.7
Non-cash interest expense	2.8	2.9	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	$ 0.0	2.3	43.5
Non-cash interest expense	$ 0.0	0.1	2.1
Interest rate (percent)	4.375%
2029 Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 32.9	32.7	0.0
Non-cash interest expense	$ 2.1	$ 2.1	$ 0.0
Interest rate (percent)	3.25%

X

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Aggregate amount of interest expense on all borrowings.

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