Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2015	Mar. 30, 2014
Deferred tax assets:
Research credits	$ 31,487	$ 24,296
Reserves and accruals not currently deductible	18,971	20,454
Stock-based compensation	14,415	15,583
Net operating loss carryforwards	9,764	11,048
Patent license	7,098	7,430
Property and equipment	2,587
Investment securities	913	1,046
Other	313	419
Total gross deferred tax assets	85,548	80,276
Valuation allowance	(20,307)	(17,672)
Total deferred tax assets, net of valuation allowance	65,241	62,604
Deferred tax liabilities:
State income taxes	10,547	10,026
Research and development expenditures	5,814	2,220
Property and equipment		1,911
Other		540
Total deferred tax liabilities	16,361	14,697
Net deferred tax assets	$ 48,880	$ 47,907