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Stock-Based Compensation Expense in Selling and Administrative Expenses (Detail) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     2,409,345  
Share-based Compensation     $ 2,970,000 $ 2,904,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 14,379   14,379  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 3 months 18 days      
Selling and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation $ 2,017,000 $ 1,872,000 2,970,000 2,904,000
Selling and Administrative Expenses | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation 460,000 69,000 540,000 146,000
Selling and Administrative Expenses | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation 1,557,000 1,381,000 2,310,000 2,284,000
Selling and Administrative Expenses | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation $ 0 $ 422,000 $ 120,000 $ 474,000
Converted Awards [Member] | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 27,272      
Converted Awards [Member] | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 877,426      
Employee Grant [Member] | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 793,126      
BOD Grant [Member] | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 46,080