Operating Segments and Geographic Data (Schedule Of Long-Lived Assets, Net Of Accumulated Depreciation, By Geographic Region) (Details) - USD ($) $ in Thousands	Sep. 24, 2021	Sep. 25, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets, net of accumulated depreciation	$ 534,381	$ 541,963
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	432,968	453,889
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 101,413	$ 88,074