Borrowings and Credit Arrangements - Interest Expense Credit Agreement (Details) - Credit Agreement 2021 - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 24, 2022
Line of Credit Facility [Line Items]
Interest expense	$ 85.8	$ 92.4	$ 31.8
Non-cash interest expense	$ 2.2	$ 2.3	$ 2.2
Weighted average interest rate	6.39%	5.84%	1.74%
Interest rate at end of period	5.96%	6.42%	4.18%