RECENT RESTAURANT EXPANSION AND OTHER DEVELOPMENTS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Business Acquisition [Line Items]
Shares - Basic (in shares)	3,522	3,502	3,512	3,500
Shares - Diluted (in shares)	3,648	3,502	3,602	3,500
Blue Moon Fish Company
Business Acquisition [Line Items]
Total revenues		$ 7,575	$ 89,708	$ 88,264
Net income (loss)		$ (2,595)	$ 6,102	$ (2,280)
Net income per share - basic (in dollars per share)		$ (0.74)	$ 1.74	$ (0.65)
Net income per share - diluted (in dollars per share)		$ (0.74)	$ 1.69	$ (0.65)
Shares - Basic (in shares)		3,502	3,512	3,500
Shares - Diluted (in shares)		3,502	3,602	3,500