Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Apr. 01, 2012
Purchased intangible assets
Carrying Amount	$ 44,166	$ 43,778
Accumulated Amortization	(35,136)	(34,023)
Net Carrying Amount	9,030	9,755
Existing technology [Member]
Purchased intangible assets
Carrying Amount	35,236	34,848
Accumulated Amortization	(28,151)	(27,286)
Net Carrying Amount	7,085	7,562
Patents/Core technology [Member]
Purchased intangible assets
Carrying Amount	3,736	3,736
Accumulated Amortization	(2,983)	(2,855)
Net Carrying Amount	753	881
Distributor relationships [Member]
Purchased intangible assets
Carrying Amount	1,264	1,264
Accumulated Amortization	(1,144)	(1,119)
Net Carrying Amount	120	145
Customer relationships [Member]
Purchased intangible assets
Carrying Amount	2,905	2,905
Accumulated Amortization	(1,833)	(1,751)
Net Carrying Amount	1,072	1,154
Tradenames / Trademarks [Member]
Purchased intangible assets
Carrying Amount	1,025	1,025
Accumulated Amortization	(1,025)	(1,012)
Net Carrying Amount		$ 13