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Stock-Based Compensation - Other Share-Based Arrangements (Detail) (Stock Appreciation Rights (SARs) [Member], USD $)
3 Months Ended
Jul. 29, 2012
Jul. 31, 2011
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  
Vesting description Vests over the period May 2, 2011 through June 30, 2012 as this represents the non-employee’s required service period  
Payment for fully vested award at fair value 174,000  
Compensation expense $ 40,000 $ 8,000