Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Income Tax Disclosure [Line Items]
Provision for (benefit from) income taxes		$ 249,000	$ 22,000	$ 172,000
Increase in unrecognized tax benefits	62,000		104,000
Unrecognized tax benefits	17,000,000		17,000,000
Unrecognized tax benefits (net of federal benefit)	$ 14,300,000		$ 14,300,000