Goodwill and Acquisition-Related Intangibles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 28, 2014	Mar. 29, 2014
Gross and net amounts of goodwill and of acquisition-related intangibles
Goodwill	$ 159,296	$ 159,296	[1]
Total acquisition-related intangibles, gross	138,576	138,576
Less accumulated amortization	(112,127)	(109,709)
Total	26,449	28,867
Core Technology [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	91,860	91,860
Less accumulated amortization	(65,612)	(63,267)
Total	26,248	28,593
Weighted-Average Amortization Life	5 years 8 months 18 days
Other Intangibles [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	46,716	46,716
Less accumulated amortization	(46,515)	(46,442)
Total	$ 201	$ 274
Weighted-Average Amortization Life	2 years 8 months 12 days

[1] Derived from audited financial statements