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Goodwill and Acquisition-Related Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended12 Months Ended
Oct. 01, 2011
Apr. 02, 2011
Gross and net amounts of goodwill and of acquisition-related intangibles  
Goodwill$ 149,693$ 133,580[1]
In-process research and development4,0006,000
Total acquisition-related intangibles, gross126,646109,640
Less accumulated amortization(86,350)(82,744)
Total acquisition-related intangibles, net40,29626,896
Core Technology [Member]
  
Gross and net amounts of goodwill and of acquisition-related intangibles  
Total acquisition-related intangibles, gross76,44058,439
Less accumulated amortization(42,751)(39,789)
Total acquisition-related intangibles, net33,68918,650
Weighted Average Amortization Life5.7 
Other Intangibles [Member]
  
Gross and net amounts of goodwill and of acquisition-related intangibles  
Total acquisition-related intangibles, gross46,20645,201
Less accumulated amortization(43,599)(42,955)
Total acquisition-related intangibles, net$ 2,607$ 2,246
Weighted Average Amortization Life2.7 
[1]Derived from audited financial statements