Information Regarding Stock Options Outstanding (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 29, 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	$ 1.00
Options Outstanding, Shares	570
Options Outstanding, Weighted Average Exercise Price	$ 0.75
Options Outstanding, Weighted Average Remaining Life	8 years 29 days
Options Exercisable Price Range, Lower Range	$ 0.44
Options Exercisable Price Range, Upper Range	$ 1.00
Options Exercisable, Shares	211
Options Exercisable, Weighted Average Exercise Price	$ 0.69
Options Exercisable, Weighted Average Remaining Life	7 years 7 months 10 days
Range 2
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Price Range, Lower range	$ 1.25
Options Outstanding Price Range, Upper Range	$ 2.50
Options Outstanding, Shares	1,499
Options Outstanding, Weighted Average Exercise Price	$ 1.82
Options Outstanding, Weighted Average Remaining Life	4 years 5 months 27 days
Options Exercisable Price Range, Lower Range	$ 1.25
Options Exercisable Price Range, Upper Range	$ 2.50
Options Exercisable, Shares	1,499
Options Exercisable, Weighted Average Exercise Price	$ 1.82
Options Exercisable, Weighted Average Remaining Life	4 years 5 months 27 days
Range 3
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Price Range, Lower range	$ 2.56
Options Outstanding Price Range, Upper Range	$ 5.34
Options Outstanding, Shares	313
Options Outstanding, Weighted Average Exercise Price	$ 2.83
Options Outstanding, Weighted Average Remaining Life	3 years 3 months
Options Exercisable Price Range, Lower Range	$ 2.56
Options Exercisable Price Range, Upper Range	$ 5.34
Options Exercisable, Shares	313
Options Exercisable, Weighted Average Exercise Price	$ 2.83
Options Exercisable, Weighted Average Remaining Life	3 years 3 months