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STOCK-BASED COMPENSATION AND STOCK OWNERSHIP PLANS (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2017
Sep. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares paid for tax withholding (shares)   17,832 19,973  
Discount from fair market value   85.00%    
Employee stock purchase plan, expense   $ 34 $ 33 $ 33
Class A        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant under plan (shares)   612,570    
Employee stock purchase plan, shares issued (shares)   1,414 7,732 8,062
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant under plan (shares)   0 0  
Tax benefit   $ 404 $ 112 $ 482
Term of award (years)   P10Y    
Number of options granted (shares)   0 0 0
Intrinsic value   $ 0 $ 0 $ 221
Cash proceeds from option exercises   0 0 118
Non-vested Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit   $ 358 476 598
Award vesting period (years)   5 years    
Fair value of vested restricted stock   $ 3,219 2,348 3,294
Stock compensation expense   941 1,252 1,287
Unrecognized compensation cost   733    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense   1,011 $ 547 $ 286
Unrecognized compensation cost   $ 791    
Restricted Stock Units (RSUs) | Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (years) 1 year      
Restricted Stock Units (RSUs) | Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (years) 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%    
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%