Composition Of Certain Financial Statement Captions (Schedule Of Other Non-Current Liabilities) (Details) - USD ($) $ in Thousands	Dec. 29, 2017	Sep. 29, 2017
Composition Of Certain Financial Statement Captions [Abstract]
Supplemental retirement plan obligations	$ 3,067	$ 2,928
Non-current tax liabilities	182,882	91,013
Other liabilities	12,862	13,573
Other non-current liabilities	$ 198,811	$ 107,514