NET INCOME PER SHARE Earnings Per Share - Summary of Shares Used in EPS Calculation (Details) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 26, 2020 USD ($) $ / shares shares	Mar. 27, 2020 USD ($)	Dec. 27, 2019 USD ($)	Jun. 28, 2019 USD ($) $ / shares shares	Mar. 29, 2019 USD ($)	Dec. 28, 2018 USD ($)	Jun. 26, 2020 USD ($) $ / shares shares	Jun. 28, 2019 USD ($) $ / shares shares
Earnings Per Share [Abstract]
Common stock, number of classes	2						2
Basic net income per share:
Net income | $	$ 2,114	$ 1,523	$ 1,189	$ 1,211	$ 670	$ 1,072	$ 4,826	$ 2,953
Less: Income attributable to non-vested shares | $	10			10			23	25
Net income available to common stockholders | $	$ 2,104			$ 1,201			$ 4,803	$ 2,928
Basic (in shares)	10,424,056			10,332,548			10,388,872	10,294,173
Basic net income (loss) per share (in usd per share) | $ / shares	$ 0.20			$ 0.12			$ 0.46	$ 0.28
Diluted net income per share:
Net income | $				$ 1,211			$ 4,826	$ 2,953
Shares used in computing basic net income (loss) per share(in shares)	10,424,056			10,332,548			10,388,872	10,294,173
Dilutive effect of non-vested shares	334,036			309,855			308,416	262,780
Shares used in computing diluted net income per share	10,758,092			10,642,403			10,697,288	10,556,953
Diluted net income (loss) per share (in usd per share) | $ / shares	$ 0.20			$ 0.11			$ 0.45	$ 0.28
Anti-dilutive shares excluded (in shares)	0			52,523			0	39,872