Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Income Taxes [Line Items]
Provision for income taxes	$ 996,000	$ 686,000	$ 3,341,000	$ 3,668,000
Retroactive reinstatement of the federal research tax credit	$ 3,700,000		$ 3,700,000
Internal Revenue Service [Member] | Tax Year 2010 [Member]
Income Taxes [Line Items]
Income tax examination, year under examination			2010
Internal Revenue Service [Member] | Tax Year 2011 [Member]
Income Taxes [Line Items]
Income tax examination, year under examination			2011
Internal Revenue Service [Member] | Tax Year 2012 [Member]
Income Taxes [Line Items]
Income tax examination, year under examination			2012