Options Outstanding and Options Exercisable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Dec. 28, 2012
Range 1
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	628
Options Outstanding, Weighted Average Exercise Price	$ 0.74
Options Outstanding, Weighted Average Remaining Life	7 years 4 months 17 days
Options Exercisable Price Range, Lower Range	$ 0.44
Options Exercisable Price Range, Upper Range	$ 1.25
Options Exercisable, Shares	306
Options Exercisable, Weighted Average Exercise Price	$ 0.72
Options Exercisable, Weighted Average Remaining Life	5 years 8 months 19 days
Range 2
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	1,474
Options Outstanding, Weighted Average Exercise Price	$ 1.82
Options Outstanding, Weighted Average Remaining Life	4 years 4 months 28 days
Options Exercisable Price Range, Lower Range	$ 1.26
Options Exercisable Price Range, Upper Range	$ 2.50
Options Exercisable, Shares	1,474
Options Exercisable, Weighted Average Exercise Price	$ 1.82
Options Exercisable, Weighted Average Remaining Life	4 years 4 months 28 days
Range 3
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	305
Options Outstanding, Weighted Average Exercise Price	$ 2.84
Options Outstanding, Weighted Average Remaining Life	2 years 6 months 4 days
Options Exercisable Price Range, Lower Range	$ 2.51
Options Exercisable Price Range, Upper Range	$ 5.34
Options Exercisable, Shares	305
Options Exercisable, Weighted Average Exercise Price	$ 2.84
Options Exercisable, Weighted Average Remaining Life	2 years 6 months 4 days