Goodwill And Intangible Assets (Components Of Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Sep. 28, 2024
Finite-Lived Intangible Assets
Weighted- Average Life (years)	12 years
Gross Carrying Amount	$ 255,952	$ 261,780
Accumulated Amortization	$ (196,483)	(198,301)
Customer-related
Finite-Lived Intangible Assets
Weighted- Average Life (years)	11 years
Gross Carrying Amount	$ 127,611	130,092
Accumulated Amortization	$ (95,481)	(96,307)
Technology-related
Finite-Lived Intangible Assets
Weighted- Average Life (years)	9 years
Gross Carrying Amount	$ 67,123	68,275
Accumulated Amortization	$ (56,166)	(56,236)
Program-related
Finite-Lived Intangible Assets
Weighted- Average Life (years)	23 years
Gross Carrying Amount	$ 38,236	39,865
Accumulated Amortization	$ (24,252)	(24,887)
Marketing-related
Finite-Lived Intangible Assets
Weighted- Average Life (years)	8 years
Gross Carrying Amount	$ 21,668	22,141
Accumulated Amortization	$ (19,288)	(19,486)
Other Intangible Assets
Finite-Lived Intangible Assets
Weighted- Average Life (years)	3 years
Gross Carrying Amount	$ 1,314	1,407
Accumulated Amortization	$ (1,296)	$ (1,385)