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Stock-Based Compensation - Other Share-Based Arrangements - Narrative (Detail) (Stock Appreciation Rights (SARs) [Member], USD $)
3 Months Ended 9 Months Ended
Jul. 29, 2012
Jan. 27, 2013
Jan. 29, 2012
Stock Appreciation Rights (SARs) [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  
Ceiling price of common stock under stock appreciation right award   $ 12  
Payment for fully vested award at fair value 174,000    
Compensation expense   $ 40,000 $ 44,000