Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Sep. 30, 2011
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 754,588	$ 673,238
Accumulated depreciation and amortization	(475,205)	(421,873)
Total property, plant and equipment, net	279,383	251,365
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	12,009	11,024
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	56,969	53,397
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	25,380	26,325
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	623,328	568,563
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 36,902	$ 13,929