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Stock-based compensation - Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 28, 2019
Jun. 01, 2019
Sep. 12, 2018
Jun. 01, 2018
Dec. 12, 2017
Mar. 28, 2020
Mar. 30, 2019
Mar. 31, 2018
Stock-based compensation                
Total number of restricted shares granted (in shares)           778,719 624,717  
Grant-date fair value (in dollars per share)           $ 6.50 $ 8.06  
Nonvested restricted shares           1,041,264 769,858 243,235
Restricted Stock Awards                
Stock-based compensation                
Stock-based compensation cost related to restricted stock awards           $ 2,162 $ 1,527 $ 506
Unrecognized compensation expense related to outstanding restricted stock awards           $ 2,786    
Average remaining service period for recognition of unrecognized compensation cost           1 year 3 months 18 days    
Amended and Restated 2013 Incentive Award Plan | Restricted Stock Awards                
Stock-based compensation                
Total number of restricted shares granted (in shares) 172,792 605,927 73,264 551,453 22,191      
Grant-date fair value (in dollars per share) $ 4.63 $ 7.03 $ 10.92 $ 7.68 $ 5.52      
Amended and Restated 2013 Incentive Award Plan | Time-based restricted shares granted on December 12, 2017                
Stock-based compensation                
Total number of restricted shares granted (in shares)         4,528      
Vesting period         3 years      
Amended and Restated 2013 Incentive Award Plan | Time-based restricted shares granted on June 1, 2018                
Stock-based compensation                
Total number of restricted shares granted (in shares)       112,553        
Vesting period       3 years        
Amended and Restated 2013 Incentive Award Plan | Time-based restricted shares granted on September 12, 2018                
Stock-based compensation                
Total number of restricted shares granted (in shares)     73,264          
Vesting period     3 years          
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On June 1 2019                
Stock-based compensation                
Total number of restricted shares granted (in shares)   123,667            
Vesting period   3 years            
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On August 28 2018                
Stock-based compensation                
Total number of restricted shares granted (in shares) 172,792              
Vesting period 3 years              
Amended and Restated 2013 Incentive Award Plan | Performance-based restricted shares granted on December 12, 2017                
Stock-based compensation                
Total number of restricted shares granted (in shares)         17,663      
Vesting period         3 years      
Performance-based restricted shares that met performance condition         9,011      
Amended and Restated 2013 Incentive Award Plan | Performance-based restricted shares granted on June 1, 2018                
Stock-based compensation                
Total number of restricted shares granted (in shares)       438,900        
Vesting period       3 years        
Performance-based restricted shares that met performance condition       205,616        
Amended and Restated 2013 Incentive Award Plan | Performance-based restricted shares granted On June 1, 2019                
Stock-based compensation                
Total number of restricted shares granted (in shares)   482,260            
Vesting period   3 years            
Performance-based restricted shares that met performance condition   182,520