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STOCK-BASED COMPENSATION AND STOCK OWNERSHIP PLANS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 02, 2017
Jun. 28, 2020
Jun. 28, 2019
Jun. 28, 2020
Jun. 28, 2019
Mar. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for grant (shares)   536,327   536,327    
Award performance period       3 years    
Class A            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee stock purchase plan shares issued (shares)   2,190 0 2,190 1,594  
Issuance of stock under employee stock purchase plan (income) expense   $ 14 $ 4 $ 44 $ 20  
Non-Vested Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares tendered for tax withholding (shares)       4,054 3,381  
Stock-based compensation expense, net of forfeitures   270 240 $ 762 $ 518  
Unrecognized stock-based compensation expense   1,446   1,446    
Fair value of vested restricted stock       $ 1,329 1,237  
Non-Vested Stock | Director | Class A            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       1 year    
Non-Vested Stock | Employees | Class A            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       4 years    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense, net of forfeitures   $ 1,161 $ 330 $ 992 1,144  
Unrecognized stock-based compensation expense           $ 1,976
Fair value of vested restricted stock       $ 1,426 $ 3,333  
Shares tendered back to company (shares)       3,075 6,509  
Restricted Stock Units (RSUs) | Vesting Period 1            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       1 year    
Restricted Stock Units (RSUs) | Vesting Period 2            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       3 years    
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Bonus achievement target level       80.00%    
Bonus payout as a percentage of target award       50.00%    
Employee stock purchase plan, purchase price 85.00%          
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Bonus achievement target level       120.00%    
Bonus payout as a percentage of target award       150.00%