STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 27, 2019 $ / shares shares	Jul. 02, 2021 USD ($) $ / shares shares	Jun. 26, 2020 USD ($) $ / shares shares
Number of Options
Outstanding, beginning of period (in shares) | shares	743,145	670,145	743,145
Granted (in shares) | shares		65,000	37,500
Exercised (in shares) | shares	(130,000)	(18,375)	(30,500)
Forfeited (in shares) | shares		(17,000)	(15,000)
Expired (in shares) | shares		(3,000)	(5,000)
Outstanding, end of period (in shares) | shares		696,770	730,145
Wgtd. Avg. Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 4.54	$ 4.67	$ 4.54
Granted (in dollars per share) | $ / shares		10.00	5.26
Exercised (in dollars per share) | $ / shares		5.14	5.29
Forfeited (in dollars per share) | $ / shares		6.81	3.92
Expired (in dollars per share) | $ / shares		3.74	6.91
Outstanding, end of period (in dollars per share) | $ / shares		$ 5.11	$ 4.54
For options expected to vest
Number expected to vest (in shares) | shares		688,815	721,416
Number expected to vest (in dollars per share) | $ / shares		$ 5.08	$ 4.53
Weighted average remaining term, in years		4 years 10 months 24 days	3 years 1 month 6 days
Intrinsic value (000s) | $		$ 3,740	$ 3,442
For exercisable options
Number exercisable (in shares) | shares		502,145	538,645
Number exercisable (in dollars per share) | $ / shares		$ 4.32	$ 4.15
Weighted average remaining term, in years		3 years 10 months 24 days	1 year 8 months 12 days
Intrinsic value (000s) | $		$ 3,095	$ 2,761
For non-exercisable options
Expense not yet recognized (000s) | $		$ 442	$ 345
Weighted average years to be recognized		2 years 10 months 24 days	2 years 10 months 24 days
For options exercised
Intrinsic value (000s) | $		$ 106	$ 93