Income Taxes - Operating Losses and Tax Credits (Details) - USD ($) $ in Thousands	Mar. 28, 2015	Mar. 29, 2014
Income Tax Disclosure [Abstract]
Federal net operating losses	$ 19,785	$ 7,691
Federal net operating losses	3,467	3,100
Foreign operating losses and tax credits	11,433	11,527
Federal research credits	19,670	18,332
State research credits	4,287	3,953
Federal minimum tax credit	1,049	1,106
Federal capital losses	8,855	4,024
Net operating loss carryforward, net of tax and tax credits	$ 68,546	$ 49,733