Purchased Intangible Assets - Components of Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Apr. 01, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 9,123	$ 12,623
Accumulated Amortization	5,069	7,346
Net Carrying Value	4,054	5,277
Acquisition-related intangibles, Core/developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,400	8,900
Accumulated Amortization	3,021	5,750
Net Carrying Value	2,379	3,150
Acquisition-related intangibles, Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,010	1,010
Accumulated Amortization	791	589
Net Carrying Value	219	421
Acquisition-related intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	6,410	9,910
Accumulated Amortization	3,812	6,339
Net Carrying Value	2,598	3,571
Other purchased intangibles, Technology-related [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,713	2,713
Accumulated Amortization	1,257	1,007
Net Carrying Value	$ 1,456	$ 1,706