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COMMON STOCK AND STOCK-BASED COMPENSATION - Allocated Compensation Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 26, 2013	Oct. 27, 2012	Oct. 26, 2013	Oct. 27, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	$ 722	$ 756	$ 1,888	$ 1,747
2010 Stock Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	650	641	1,248	1,272
2010 Stock Plan \| RSA's
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	368	366	736	732
2010 Stock Plan \| RSU's
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	74	132	147	264
2010 Stock Plan \| Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	208	143	365	276
2007 Stock Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	72	115	640	475
2007 Stock Plan \| RSA's
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	0	0	466	233
2007 Stock Plan \| Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense	$ 72	$ 115	$ 174	$ 242

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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