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Stock-based compensation - Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 31, 2022
Jun. 01, 2022
Mar. 29, 2022
Sep. 01, 2021
Jun. 01, 2021
Feb. 01, 2021
Aug. 26, 2020
Jun. 01, 2020
Apr. 01, 2023
Apr. 02, 2022
Apr. 03, 2021
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)                 1,148,073 432,167  
Grant-date fair value (in dollars per share)                 $ 7.45 $ 12.80  
Restricted Stock Awards                      
Market-Based Share Awards                      
Unrecognized compensation expense related to outstanding restricted stock awards                 $ 2,638    
Stock-based compensation costs                 $ 3,382 $ 4,262 $ 7,470
Average remaining service period for recognition of unrecognized compensation cost                 1 year 1 month 6 days    
Amended and Restated 2013 Incentive Award Plan | Restricted Stock Awards                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares) 153,392 994,681 6,408 90,040 335,719 50,100 203,048 1,358,709      
Grant-date fair value (in dollars per share) $ 6.78 $ 7.56 $ 8.67 $ 11.55 $ 13.22 $ 15.51 $ 3.94 $ 3.03      
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On June 1 2020                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)               336,876      
Vesting period               3 years      
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On August 26 2020                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)             203,048        
Vesting period             3 years        
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On February 1 2021                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)           50,100          
Vesting period           3 years          
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On June 1 2021                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)         98,343            
Vesting period         3 years            
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On September 1 2021                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)       90,040              
Vesting period       1 year              
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On March 29 2021                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)     6,408                
Vesting period     1 year                
Amended and Restated 2013 Incentive Award Plan | Time Based Restricted Shares Granted On June 1 2022                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)   234,062                  
Vesting period   3 years                  
Amended and Restated 2013 Incentive Award Plan | Time-based restricted shares granted on August 31, 2022                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares) 153,392                    
Vesting period 1 year                    
Amended and Restated 2013 Incentive Award Plan | Performance Based Restricted Shares Granted On June 1 2020                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)               1,021,833      
Vesting period               3 years      
Performance-based restricted shares that met performance condition               1,021,833      
Amended and Restated 2013 Incentive Award Plan | Performance Based Restricted Shares Granted On June 1 2021                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)         237,376            
Vesting period         3 years            
Performance-based restricted shares that met performance condition         237,376            
Amended and Restated 2013 Incentive Award Plan | Performance Based Restricted Shares Granted On June 1 2022                      
Market-Based Share Awards                      
Total number of restricted shares granted (in shares)   760,619                  
Vesting period   3 years                  
Performance-based restricted shares that met performance condition   0