Composition Of Certain Financial Statement Captions (Narrative) (Details) - USD ($) $ in Thousands	Mar. 29, 2019	Sep. 28, 2018
Composition Of Certain Financial Statement Captions [Line Items]
Raw materials	$ 10,122	$ 6,095
Capital expenditures incurred, but not yet paid	10,010	13,956
Other Noncurrent Assets [Member]
Composition Of Certain Financial Statement Captions [Line Items]
Raw materials	$ 2,300	$ 2,600