STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Jun. 26, 2020	Jun. 28, 2019
Number of Options
Outstanding, beginning of period (in shares)	743,145	737,145
Granted (in shares)	37,500	20,000
Exercised (in shares)	(30,500)	(34,000)
Forfeited (in shares)	(15,000)	(24,250)
Expired (in shares)	(5,000)	(5,750)
Outstanding, end of period (in shares)	730,145	693,145
Wgtd. Avg. Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 4.54	$ 4.33
Granted (in dollars per share)	5.26	6.12
Exercised (in dollars per share)	5.29	4.46
Forfeited (in dollars per share)	3.92	3.70
Expired (in dollars per share)	6.91	4.06
Outstanding, end of period (in dollars per share)	$ 4.54	$ 4.40
For options expected to vest
Number expected to vest (in shares)	721,416	685,354
Number expected to vest (in dollars per share)	$ 4.53	$ 4.39
Weighted average remaining term, in years	3 years 1 month 6 days	3 years 4 months 24 days
Intrinsic value (000s)	$ 3,442	$ 1,306
For exercisable options
Number exercisable (in shares)	538,645	533,645
Number exercisable (in dollars per share)	$ 4.15	$ 4.18
Weighted average remaining term, in years	1 year 8 months 12 days	2 years 8 months 12 days
Intrinsic value (000s)	$ 2,761	$ 1,132
For non-exercisable options
Expense not yet recognized (000s)	$ 345	$ 232
Weighted average years to be recognized	2 years 10 months 24 days	3 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 93	$ 77