Description Of Business and Basis Of Presentation (New Accounting Pronouncements) (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 27, 2020	Sep. 28, 2019	Sep. 27, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 171.3		$ 0.0
Operating Lease, Liability	$ 172.6
Document Period End Date	Mar. 27, 2020
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 141.4
Operating Lease, Liability		$ 143.1