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Stock-Based Compensation - Stock Options and Significant Valuation Assumptions (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 20, 2019
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Assumptions used          
Expected option term   6 years 3 months 18 days   6 years 3 months 18 days  
Expected volatility factor   58.40%      
Expected volatility factor, minimum       57.00% 35.30%
Expected volatility factor, maximum       58.40% 35.60%
Risk-free interest rate   0.30%     2.30%
Risk-free interest rate, minimum       0.30%  
Risk-free interest rate, maximum       0.40%  
Expected annual dividend yield   0.00%   0.00% 0.00%
Stock Options          
Outstanding at the beginning of period       1,221,223  
Granted       287,373  
Exercised       (9,434)  
Canceled, forfeited or expired       (8,727)  
Outstanding at the end of period   1,490,435   1,490,435  
Vested and expected to vest after end of period   1,490,435   1,490,435  
Exercisable at end of period   516,252   516,252  
Grant Date Weighted-Average Exercise Price          
Outstanding at the beginning of period       $ 19.96  
Granted       22.50  
Exercise price (in dollars per share)       6.44  
Canceled, forfeited or expired       17.91  
Outstanding at the end of period   $ 20.55   20.55  
Vested and expected to vest at end of period   20.55   20.55  
Exercisable at end of period   $ 18.61   $ 18.61  
Weighted Average Remaining Contractual Life          
Weighted average remaining contractual life, awards outstanding       6 years 4 months 24 days  
Weighted average remaining contractual life, awards vested and expected to vest       6 years 4 months 24 days  
Weighted average remaining contractual life, awards exercisable       4 years 1 month 6 days  
Aggregate Intrinsic Value          
Aggregate intrinsic value, awards exercised       $ 167  
Aggregate intrinsic value, awards outstanding   $ 11,041   11,041  
Aggregate intrinsic value, awards vested and expected to vest   11,041   11,041  
Aggregate intrinsic value, awards exercisable   $ 4,802   $ 4,802  
2014 Plan          
Assumptions used          
Exercise price (in dollars per share)   $ 23.57 $ 28.63 $ 23.57 $ 28.63
Stock Options          
Granted   22,838 0 287,373 116,952
Minimum          
Assumptions used          
Expected option term         6 years 3 months 18 days
Minimum | 2014 Plan          
Assumptions used          
Exercise price (in dollars per share)   $ 20.94   $ 20.94  
Maximum          
Assumptions used          
Expected option term         7 years
Maximum | 2014 Plan          
Assumptions used          
Exercise price (in dollars per share)   $ 24.08   $ 24.08  
CEO | 2014 Plan          
Assumptions used          
Stock price (in dollars per share) $ 28.63        
Exercise price (in dollars per share) $ 28.63   $ 28.63   $ 28.63
Expected option term 7 years        
Expected volatility factor 35.30%        
Risk-free interest rate 2.30%        
Expected annual dividend yield 0.00%        
Stock Options          
Granted         227,273