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Stock-Based Compensation - Other Share-Based Arrangements - Narrative (Detail) (Stock Appreciation Rights (SARs) [Member], USD $)
3 Months Ended 12 Months Ended
Jul. 29, 2012
Apr. 27, 2014
Apr. 28, 2013
Selling, general and administrative expense [Member]
Apr. 29, 2012
Selling, general and administrative expense [Member]
Share-based Goods and Nonemployee Services Transaction [Line Items]        
Agreement date   May 02, 2011    
Number of shares indexed   70,000    
Cash settlement   $ 35,000    
Stock appreciation right value   700,000    
Closing price of common stock at the date of grant   $ 10.00    
Ceiling price of common stock under stock appreciation right award   $ 12.00    
Payment for fully vested award at fair value 174,000      
Compensation expense     $ 40,000 $ 134,000