Property, Plant and Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 29, 2017	Sep. 29, 2017
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 2,107.9	$ 2,059.0
Accumulated depreciation	(1,238.8)	(1,176.7)
Total property, plant and equipment, net	869.1	882.3
Land and improvements [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	11.6	11.6
Building and improvements [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	142.3	137.8
Furniture and fixtures [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	29.7	29.5
Machinery and equipment [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	1,815.3	1,715.3
Construction in progress [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 109.0	$ 164.8