STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Number of Options
Outstanding, beginning of period (in shares)	743,145	737,145
Granted (in shares)	0	0
Exercised (in shares)	(24,000)	(11,500)
Forfeited (in shares)	(10,000)	(17,500)
Expired (in shares)	(5,000)	(5,000)
Outstanding, end of period (in shares)	704,145	703,145
Wgtd. Avg. Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 4.54	$ 4.33
Granted (in dollars per share)	0.00	0.00
Exercised (in dollars per share)	5.42	3.99
Forfeited (in dollars per share)	3.58	3.61
Expired (in dollars per share)	6.91	4.08
Outstanding, end of period (in dollars per share)	$ 4.51	$ 4.35
For options expected to vest
Number expected to vest (in shares)	695,555	693,289
Number expected to vest (in dollars per share)	$ 4.49	$ 4.34
Weighted average remaining term, in years	3 years 5 months 13 days	3 years 9 months
Intrinsic value (000s)	$ 3,283	$ 1,008
For exercisable options
Number exercisable (in shares)	541,645	420,858
Number exercisable (in dollars per share)	$ 4.16	$ 4.24
Weighted average remaining term, in years	2 years 5 months 5 days	3 years 1 month 1 day
Intrinsic value (000s)	$ 2,738	$ 664
For non-exercisable options
Expense not yet recognized (000s)	$ 304	$ 269
Weighted average years to be recognized	3 years 18 days	2 years 11 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 64	$ 23