Composition Of Certain Financial Statement Captions (Schedule Of Other Non-Current Liabilities) (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 28, 2018
Composition Of Certain Financial Statement Captions [Abstract]
Supplemental retirement plan obligations	$ 3,190	$ 3,388
Non-current tax liabilities	133,322	129,253
Other liabilities	19,894	18,319
Other non-current liabilities	$ 156,406	$ 150,960