Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 29, 2013	Apr. 01, 2011	Mar. 30, 2012
Income Tax [Line Items]
Unrealized excess tax benefits associated with share based compensation	$ 21,900,000
Realized excess tax benefits	0	1,303,000
Valuation allowance	15,965,000		14,695,000
Impact on effective tax rate	27,900,000
Reasonably possible decrease in unrecognized tax benefits in the next twelve months	1,300,000
Accrued interest or penalties associated with uncertain tax positions	0		0
Federal [Member]
Income Tax [Line Items]
Operating loss carryforwards	678,300,000
Operating loss carryforwards expiration dates	Fiscal year 2020
Tax years subject to examination	2009
Federal [Member] | Research [Member]
Income Tax [Line Items]
Tax credit carryforwards	65,500,000
Federal [Member] | Research [Member] | Minimum [Member]
Income Tax [Line Items]
Tax credit carryforwards expiration dates	Mar. 29, 2025
State [Member]
Income Tax [Line Items]
Operating loss carryforwards	501,500,000
Operating loss carryforwards expiration dates	Fiscal year 2013
Tax years subject to examination	2009
State [Member] | Research [Member]
Income Tax [Line Items]
Tax credit carryforwards	$ 69,600,000
State [Member] | Research [Member] | Minimum [Member]
Income Tax [Line Items]
Tax credit carryforwards expiration dates	Apr. 01, 2017
Foreign country [Member]
Income Tax [Line Items]
Tax years subject to examination	2009