Options Outstanding and Options Exercisable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Sep. 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	637
Options Outstanding, Weighted Average Exercise Price	$ 0.73
Options Outstanding, Weighted Average Remaining Life	7 years 6 months 4 days
Options Exercisable Price Range, Lower Range	$ 0.44
Options Exercisable Price Range, Upper Range	$ 1.25
Options Exercisable, Shares	257
Options Exercisable, Weighted Average Exercise Price	$ 0.73
Options Exercisable, Weighted Average Remaining Life	5 years 29 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	1,496
Options Outstanding, Weighted Average Exercise Price	$ 1.82
Options Outstanding, Weighted Average Remaining Life	4 years 7 months 10 days
Options Exercisable Price Range, Lower Range	$ 1.26
Options Exercisable Price Range, Upper Range	$ 2.50
Options Exercisable, Shares	1,496
Options Exercisable, Weighted Average Exercise Price	$ 1.82
Options Exercisable, Weighted Average Remaining Life	4 years 7 months 10 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 9 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 9 months 4 days