Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Mar. 31, 2013
Deferred tax assets:
Research credits	$ 24,296	$ 17,103
Reserves and accruals not currently deductible	20,454	16,968
Stock-based compensation	15,583	18,036
Net operating loss carryforwards	11,048	12,408
Patent license	7,430
Investment securities	1,046	1,267
Other	419	657
Total gross deferred tax assets	80,276	66,439
Valuation allowance	(17,672)	(1,239)
Total deferred tax assets, net of valuation allowance	62,604	65,200
Deferred tax liabilities:
State income taxes	10,026	9,315
Research and development expenditures	2,220	4,198
Property and equipment	1,911	6,149
Purchased intangible assets	540	510
Total deferred tax liabilities	14,697	20,172
Net deferred tax assets	$ 47,907	$ 45,028