Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $)	12 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Deferred tax assets:
Deferred income on shipments to distributors	$ 3,057,000us-gaap_DeferredTaxAssetsDeferredIncome	$ 2,666,000us-gaap_DeferredTaxAssetsDeferredIncome
Non-deductible accruals and reserves	9,148,000	10,233,000
Inventory related and other expenses	189,000us-gaap_DeferredTaxAssetsInventory	1,761,000us-gaap_DeferredTaxAssetsInventory
Net operating losses and credit carryforwards	122,178,000	114,858,000
Depreciation and amortization	12,274,000	13,725,000
Stock options	1,849,000	1,713,000
Other	1,737,000us-gaap_DeferredTaxAssetsOther	315,000us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	150,432,000us-gaap_DeferredTaxAssetsGross	145,271,000us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Purchased intangibles	(564,000)	(558,000)
Other	(2,699,000)us-gaap_DeferredTaxLiabilitiesOther	(3,087,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(3,263,000)us-gaap_DeferredIncomeTaxLiabilities	(3,645,000)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance	(148,954,000)	(143,704,000)
Net deferred tax liabilities	(1,785,000)us-gaap_DeferredTaxLiabilities	(2,078,000)us-gaap_DeferredTaxLiabilities
Change in valuation allowance for deferred tax assets	5,300,000	9,100,000
Amount of net tax benefits related to stock compensation benefits not recorded as DTAs	30,500,000
Research
Deferred tax liabilities:
Tax credit carryforwards	56,700,000
Foreign Tax Credit
Deferred tax liabilities:
Tax credit carryforwards	16,800,000
Amount of tax credit carryforwards to expire	9,000,000
State Income Tax Credit
Deferred tax liabilities:
Tax credit carryforwards	80,800,000
Amount of tax credit carryforwards to expire	5,700,000
Federal
Deferred tax liabilities:
Net operating loss carryforwards	82,300,000
State
Deferred tax liabilities:
Net operating loss carryforwards	$ 102,600,000

Deferred Tax Asset Not Recognized, Amount of Unrecognized Deferred Tax Asset

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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