Composition Of Certain Financial Statement Captions (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2013	Sep. 27, 2013
Finite-Lived Intangible Assets [Line Items]
Cost	$ 131,848	$ 131,640
Accumulated Amortization	(93,852)	(90,325)
Total	37,996	41,315
Acquired Patents And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	80,106	79,925
Accumulated Amortization	(53,693)	(51,267)
Total	26,413	28,658
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	30,724	30,723
Accumulated Amortization	(20,394)	(19,592)
Total	10,330	11,131
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	21,018	20,992
Accumulated Amortization	(19,765)	(19,466)
Total	$ 1,253	$ 1,526