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STOCK-BASED COMPENSATION AND STOCK OWNERSHIP PLANS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 02, 2017
Mar. 27, 2020
Mar. 29, 2019
Mar. 27, 2020
Mar. 29, 2019
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)   0 1,594 0 1,594
Issuance of stock under employee stock purchase plan (income) expense   $ 51 $ (2) $ 58 $ 14
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   252 160 $ 492 $ 278
Unrecognized stock-based compensation expense   1,716   1,716  
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   (589) $ 414 $ (169) 816
Unrecognized stock-based compensation expense   $ 1,949   1,949  
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%