Income Taxes (Details Textual) (USD $)	12 Months Ended
	Mar. 30, 2012	Apr. 01, 2011	Apr. 02, 2010	Apr. 03, 2009
Income Tax Contingency [Line Items]
Amount included in the unrecognized tax benefits due to timing of deductibility is uncertain	$ 33,556,000	$ 33,015,000	$ 31,759,000	$ 37,917,000
Income Taxes (Textual) [Abstract]
Tax benefit from exercise of stock options and release of RSU awards	0	1,303,000
Unrealized excess tax benefits associated with share based compensation	17,300,000
Valuation allowance	(14,695,000)	(12,671,000)
Impact on effective tax rate	26,400,000
Reasonably possible decrease in unrecognized tax benefits in the next twelve months	2,500,000
Accrued interest or penalties associated with uncertain tax positions	0
Impact of the Internal Revenue Service Examination of U.S. federal tax returns completed during the period	0
Timing uncertainty of tax deductible [Member]
Income Tax Contingency [Line Items]
Amount included in the unrecognized tax benefits due to timing of deductibility is uncertain	800,000
Federal [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination	fiscal years 2009 to 2011
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	467,900,000
Operating loss carryforwards expiration dates	Fiscal year 2020
Federal [Member] | Research [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	52,200,000
Tax credit carryforwards expiration dates	Fiscal year 2026
State [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination	fiscal years 2008 to 2011
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	347,400,000
Operating loss carryforwards expiration dates	Fiscal year 2013
State [Member] | Research [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 58,600,000
Tax credit carryforwards expiration dates	Fiscal year 2018
Foreign Country [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination	fiscal years 2008 to 2011