Goodwill And Intangible Assets (Components Of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 27, 2025	Sep. 28, 2024
Finite-Lived Intangible Assets
Weighted-Average Life (years)	12 years
Gross Carrying Amount	$ 271,701	$ 261,780
Accumulated Amortization	$ (205,600)	(198,301)
Customer-Related
Finite-Lived Intangible Assets
Weighted-Average Life (years)	11 years
Gross Carrying Amount	$ 131,967	130,092
Accumulated Amortization	$ (100,655)	(96,307)
Technology-Related
Finite-Lived Intangible Assets
Weighted-Average Life (years)	9 years
Gross Carrying Amount	$ 77,172	68,275
Accumulated Amortization	$ (57,817)	(56,236)
Program-Related
Finite-Lived Intangible Assets
Weighted-Average Life (years)	23 years
Gross Carrying Amount	$ 39,799	39,865
Accumulated Amortization	$ (26,476)	(24,887)
Marketing-Related
Finite-Lived Intangible Assets
Weighted-Average Life (years)	8 years
Gross Carrying Amount	$ 21,387	22,141
Accumulated Amortization	$ (19,320)	(19,486)
Other Intangible Assets
Finite-Lived Intangible Assets
Weighted-Average Life (years)	3 years
Gross Carrying Amount	$ 1,376	1,407
Accumulated Amortization	$ (1,332)	$ (1,385)