Income Taxes - Operating Losses and Tax Credits (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Federal net operating losses	$ 0	$ 1,308
Federal net operating losses	2,863	3,004
Foreign operating losses and tax credits	9,923	3,099
Federal research credits	17,633	15,010
State research credits	4,439	4,630
Federal minimum tax credit	1,171	1,246
Federal capital losses	4,038	4,111
Net operating loss carryforward, net of tax and tax credits	$ 40,067	$ 32,408

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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- Definition

The cumulative amount of future tax effects arising from the unused tax credit carryforward attributable to some other tax carryforward (not otherwise stated) that cannot be utilized on the tax return during the period and that may be carried forward and are expected to more likely than not be used to reduce taxable income or taxes payable in future periods.

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