Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - Senior Notes - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 24, 2022	Sep. 28, 2020	Jan. 19, 2018
Debt Instrument [Line Items]
Interest expense	$ 52.1	$ 53.0	$ 52.1
Non-cash interest expense	$ 2.8	2.8	2.8
2029 Senior Notes
Debt Instrument [Line Items]
Interest rate (percent)	3.25%			3.25%
Interest expense	$ 32.9	33.5	32.9
Non-cash interest expense	$ 2.1	2.1	2.1
2028 Senior Notes
Debt Instrument [Line Items]
Interest rate (percent)	4.625%				4.625%
Interest expense	$ 19.2	19.5	19.2
Non-cash interest expense	$ 0.7	$ 0.7	$ 0.7