Property, Plant and Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Mar. 27, 2020	Sep. 27, 2019
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 3,019.4	$ 2,883.9
Accumulated depreciation	(1,811.5)	(1,678.3)
Total property, plant and equipment, net	1,207.9	1,205.6
Land and improvements [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	11.8	11.7
Building and improvements [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	402.9	354.4
Furniture and fixtures [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	43.7	33.8
Machinery and equipment [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	2,353.3	2,311.5
Construction in progress [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 207.7	$ 172.5