Options Outstanding and Options Exercisable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Sep. 27, 2013
$0.44 - $1.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Price Range, Lower range	$ 0.44
Options Outstanding Price Range, Upper Range	$ 1.25
Options Outstanding, Shares	549
Options Outstanding, Weighted Average Exercise Price	$ 0.70
Options Outstanding, Weighted Average Remaining Life	7 years 9 months 15 days
Options Exercisable Price Range, Lower Range	$ 0.44
Options Exercisable Price Range, Upper Range	$ 1.25
Options Exercisable, Shares	387
Options Exercisable, Weighted Average Exercise Price	$ 0.66
Options Exercisable, Weighted Average Remaining Life	7 years 6 months 26 days
$1.26 - $2.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Price Range, Lower range	$ 1.26
Options Outstanding Price Range, Upper Range	$ 2.50
Options Outstanding, Shares	1,440
Options Outstanding, Weighted Average Exercise Price	$ 1.82
Options Outstanding, Weighted Average Remaining Life	3 years 7 months 6 days
Options Exercisable Price Range, Lower Range	$ 1.26
Options Exercisable Price Range, Upper Range	$ 2.50
Options Exercisable, Shares	1,440
Options Exercisable, Weighted Average Exercise Price	$ 1.82
Options Exercisable, Weighted Average Remaining Life	3 years 7 months 6 days
$2.56 - $5.34
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Price Range, Lower range	$ 2.51
Options Outstanding Price Range, Upper Range	$ 5.34
Options Outstanding, Shares	290
Options Outstanding, Weighted Average Exercise Price	$ 2.84
Options Outstanding, Weighted Average Remaining Life	1 year 8 months 2 days
Options Exercisable Price Range, Lower Range	$ 2.51
Options Exercisable Price Range, Upper Range	$ 5.34
Options Exercisable, Shares	290
Options Exercisable, Weighted Average Exercise Price	$ 2.84
Options Exercisable, Weighted Average Remaining Life	1 year 8 months 12 days