Goodwill and Intangible Assets - Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 30, 2012	Apr. 01, 2012
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 43,971	$ 43,778
Accumulated Amortization	(37,178)	(34,023)
Net Carrying Amount	6,793	9,755
Existing technology [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	35,318	34,848
Accumulated Amortization	(29,829)	(27,286)
Net Carrying Amount	5,489	7,562
Patents/Core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	3,459	3,736
Accumulated Amortization	(3,133)	(2,855)
Net Carrying Amount	326	881
Distributor relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	1,264	1,264
Accumulated Amortization	(1,194)	(1,119)
Net Carrying Amount	70	145
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	2,905	2,905
Accumulated Amortization	(1,997)	(1,751)
Net Carrying Amount	908	1,154
Tradenames/Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	1,025	1,025
Accumulated Amortization	(1,025)	(1,012)
Net Carrying Amount		$ 13