Goodwill And Intangible Assets (Components Of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 28, 2026	Sep. 27, 2025
Intangible Asset, Finite-Lived
Weighted- Average Life (years)	12 years
Gross Carrying Amount	$ 274,569	$ 271,701
Accumulated Amortization	$ (214,025)	(205,600)
Customer-related
Intangible Asset, Finite-Lived
Weighted- Average Life (years)	11 years
Gross Carrying Amount	$ 132,645	131,967
Accumulated Amortization	$ (103,738)	(100,655)
Technology-related
Intangible Asset, Finite-Lived
Weighted- Average Life (years)	9 years
Gross Carrying Amount	$ 78,515	77,172
Accumulated Amortization	$ (61,048)	(57,817)
Program-related
Intangible Asset, Finite-Lived
Weighted- Average Life (years)	23 years
Gross Carrying Amount	$ 39,770	39,799
Accumulated Amortization	$ (27,271)	(26,476)
Marketing-related
Intangible Asset, Finite-Lived
Weighted- Average Life (years)	8 years
Gross Carrying Amount	$ 22,336	21,387
Accumulated Amortization	$ (20,697)	(19,320)
Other Intangible Assets
Intangible Asset, Finite-Lived
Weighted- Average Life (years)	3 years
Gross Carrying Amount	$ 1,303	1,376
Accumulated Amortization	$ (1,271)	$ (1,332)