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Goodwill and Acquisition-Related Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 26, 2015
Mar. 28, 2015
Gross and net amounts of goodwill and of acquisition-related intangibles    
Goodwill $ 159,296 $ 159,296 [1]
Total acquisition-related intangibles, gross 124,246 124,246
Less accumulated amortization (115,032) (111,494)
Total 9,214 12,752
Core Technology [Member]    
Gross and net amounts of goodwill and of acquisition-related intangibles    
Total acquisition-related intangibles, gross 77,640 77,640
Less accumulated amortization (68,493) (64,988)
Total $ 9,147 12,652
Weighted-Average Amortization Life 5 years 7 months 18 days  
Other Intangibles [Member]    
Gross and net amounts of goodwill and of acquisition-related intangibles    
Total acquisition-related intangibles, gross $ 46,606 46,606
Less accumulated amortization (46,539) (46,506)
Total $ 67 $ 100
Weighted-Average Amortization Life 2 years 8 months 12 days  
[1] Derived from audited financial statements