Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
	Mar. 23, 2013	Apr. 28, 2012	Mar. 23, 2013	Apr. 28, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ (112)	$ 951	$ 1,275	$ 2,872
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	23	297	312	879
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	10	64	126	194
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	20	179	312	545
Discontinued Operation
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ (165)	$ 411	$ 525	$ 1,254