Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Sep. 27, 2019
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months			$ 26.7
Operating Lease, Payments	$ 5.1
Operating Lease, Weighted Average Remaining Lease Term	8 years 3 months 3 days
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 11.8
Operating Lease, Expense	5.7	$ 4.7
Variable Lease, Cost	1.1
Lessee, Operating Lease, Liability, Payments, Due Year Two	23.4
Lessee, Operating Lease, Liability, Payments, Due Year Three	22.1
Lessee, Operating Lease, Liability, Payments, Due Year Four	21.8
Lessee, Operating Lease, Liability, Payments, Due Year Five	20.1
Lessee, Operating Lease, Liability, Payments, Due after Year Five	89.7
Lessee, Operating Lease, Liability, Payments, Due	188.9
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(28.7)
Operating Lease, Liability	160.2
Operating Lease, Liability, Current	(9.3)
Operating Lease, Liability, Noncurrent	$ 150.9		0.0
Operating Lease, Weighted Average Discount Rate, Percent	3.37%
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 20.7
Operating Leases, Future Minimum Payments, Due in Two Years			25.9
Operating Leases, Future Minimum Payments, Due in Three Years			24.8
Operating Leases, Future Minimum Payments, Due in Four Years			23.3
Operating Leases, Future Minimum Payments, Due in Five Years			21.5
Operating Leases, Future Minimum Payments, Due Thereafter			97.7
Operating Leases, Future Minimum Payments Due			$ 219.9