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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
May. 02, 2011
Jul. 29, 2012
Apr. 28, 2013
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  
Selling, general and administrative expenses [Member]      
Share-based Goods and Nonemployee Services Transaction [Line Items]      
Compensation expense     $ 40,000