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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 02, 2020
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 6,638 $ 9,017 $ 8,459  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 6,400      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 35,494      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 10,409,345      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 6 months 28 days      
Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 6,638 $ 9,017 $ 8,459  
Restricted Stock [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 38,096 21,506 19,704 12,371
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 3.15 $ 5.58 $ 6.09 $ 9.70
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 38,096 21,506 19,704  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 3.15 $ 5.58 $ 6.09  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 21,506 19,704 12,371  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 5.58 $ 6.09 $ 9.70  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 0.00 $ 0.00 $ 0.00  
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 120 $ 110 $ 120  
Restricted Stock Units (RSUs) [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2,250,078 2,352,317 2,320,124 1,731,623
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 4.21 $ 6.12 $ 7.47 $ 10.70
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 1,541,154 1,443,746 1,640,926  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 3.08 $ 5.58 $ 5.88  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 1,138,984 1,056,486 697,370  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 6.56 $ 8.31 $ 10.93  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 504,409 355,067 355,055  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 4.69 $ 6.23 $ 9.04  
Restricted Stock Units (RSUs) [Member] | Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 6,253 $ 7,846 $ 8,370  
Performance Shares [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 0 225,511 285,936 406,078
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 0.00 $ 9.52 $ 9.52 $ 9.52
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.00 $ 0.00 $ 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 56,380 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 9.52 $ 0.00 $ 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 169,131 60,425 120,142  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 9.52 $ 9.52 $ 9.52  
Performance Shares [Member] | Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 12 $ 87 $ (218)  
Performance Share Units [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,323,767 765,899 537,756 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 4.20 $ 6.25 $ 7.90 $ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 709,517 385,171 537,756  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 2.23 $ 4.18 $ 7.90  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 0 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 0.00 $ 0.00 $ 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 151,649 157,028 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 5.31 $ 6.83 $ 0.00  
Performance Share Units (PSUs) [Member] | Selling, General and Administrative Expenses [Member]        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Stock-based compensation expense $ 253 $ 974 $ 187