Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Jun. 27, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Original Cost	$ 662,570	$ 657,575
Accumulated Amortization	598,552	578,811
Total amortizable intangible assets	64,018	78,764
In-process Research and Development	2,980	9,195
Gross Intangible Assets	665,550	666,770
Intangible assets, net	66,998	87,959
Intellectual property [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Original Cost	530,191	525,196
Accumulated Amortization	474,606	458,418
Total amortizable intangible assets	55,585	66,778
Customer relationships [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Original Cost	118,335	118,335
Accumulated Amortization	111,499	108,603
Total amortizable intangible assets	6,836	9,732
Trade Names [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Original Cost	11,374	11,374
Accumulated Amortization	9,777	9,265
Total amortizable intangible assets	1,597	2,109
Order or Production Backlog [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Original Cost	170	170
Accumulated Amortization	170	25
Total amortizable intangible assets	0	145
Patents [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Original Cost	2,500	2,500
Accumulated Amortization	2,500	2,500
Total amortizable intangible assets	$ 0	$ 0