Income Taxes (Details 2) (USD $)	12 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Deferred tax assets:
Deferred income on shipments to distributors	$ 2,666,000	$ 2,576,000
Non-deductible accruals and reserves	10,233,000	9,778,000
Inventory related and other expenses	1,761,000	1,427,000
Net operating losses and credit carryforwards	114,858,000	97,337,000
Depreciation and amortization	13,725,000	24,864,000
Stock options	1,713,000	4,193,000
Other	315,000	369,000
Total deferred tax assets	145,271,000	140,544,000
Deferred tax liabilities:
Purchased intangibles	(558,000)	(4,158,000)
U.S. tax on earnings of foreign subsidiaries not indefinitely reinvested	0	0
Other	(3,087,000)	(3,633,000)
Total deferred tax liabilities	(3,645,000)	(7,791,000)
Valuation allowance	(143,704,000)	(134,633,000)
Net deferred tax liabilities	2,078,000	1,880,000
Change in valuation allowance for deferred tax assets	9,100,000	3,000,000
Amount of net tax benefits related to stock compensation benefits not recorded as DTAs	17,200,000
Research
Deferred tax liabilities:
Tax credit carryforwards	54,400,000
Foreign Tax Credit
Deferred tax liabilities:
Tax credit carryforwards	16,800,000
State Income Tax Credit
Deferred tax liabilities:
Tax credit carryforwards	78,000,000
Amount of tax credit carryforwards to expire	4,700,000
Federal
Deferred tax liabilities:
Net operating loss carryforwards	53,000,000
State
Deferred tax liabilities:
Net operating loss carryforwards	$ 104,800,000