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Stock-Based Compensation - Stock Options and Significant Valuation Assumptions (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
May 20, 2019
Jun. 27, 2020
Jun. 29, 2019
Stock Options      
Stock Options      
Outstanding at the beginning of period   1,221,223  
Granted   264,535  
Exercised   (630)  
Canceled, forfeited or expired   (7,494)  
Outstanding at the end of period   1,477,634  
Vested and expected to vest after end of period   1,477,634  
Exercisable at end of period   522,264  
Grant Date Weighted-Average Exercise Price      
Outstanding at the beginning of period   $ 19.96  
Granted   22.41  
Exercise price (in dollars per share)   6.84  
Canceled, forfeited or expired   16.92  
Outstanding at the end of period   20.42  
Vested and expected to vest at end of period   20.42  
Exercisable at end of period   $ 18.37  
Weighted Average Remaining Contractual Life      
Weighted average remaining contractual life, awards outstanding   6 years 7 months 6 days  
Weighted average remaining contractual life, awards vested and expected to vest   6 years 7 months 6 days  
Weighted average remaining contractual life, awards exercisable   4 years 3 months 18 days  
Aggregate Intrinsic Value      
Aggregate intrinsic value, awards exercised   $ 10  
Aggregate intrinsic value, awards outstanding   4,846  
Aggregate intrinsic value, awards vested and expected to vest   4,846  
Aggregate intrinsic value, awards exercisable   $ 2,335  
2014 Plan | Stock Options      
Stock Options      
Granted   264,535  
CEO | 2014 Plan      
Assumptions used      
Stock price (in dollars per share) $ 28.63    
Exercise price (in dollars per share) $ 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
Members of management | 2014 Plan      
Assumptions used      
Expected option term   6 years 3 months 18 days  
Expected volatility factor   57.00%  
Expected volatility factor, minimum     35.30%
Expected volatility factor, maximum     35.60%
Risk-free interest rate   0.40% 2.30%
Expected annual dividend yield   0.00% 0.00%
Members of management | 2014 Plan | Stock Options      
Assumptions used      
Exercise price (in dollars per share)     $ 28.63
Stock Options      
Granted   264,535 116,952
Members of management | Minimum | 2014 Plan      
Assumptions used      
Expected option term     6 years 3 months 18 days
Members of management | Minimum | 2014 Plan | Stock Options      
Assumptions used      
Exercise price (in dollars per share)   $ 20.94  
Members of management | Maximum | 2014 Plan      
Assumptions used      
Expected option term     7 years
Members of management | Maximum | 2014 Plan | Stock Options      
Assumptions used      
Exercise price (in dollars per share)   $ 24.08