RECENT RESTAURANT EXPANSION AND OTHER DEVELOPMENTS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Business Acquisition [Line Items]
Basic (in shares)	3,502	3,499
Diluted (in shares)	3,502	3,541
Blue Moon Fish Company
Business Acquisition [Line Items]
Total revenues	$ 20,976	$ 45,050
Net income	$ (728)	$ 1,857
Net income per share - basic (in USD per share)	$ (0.21)	$ 0.53
Net income per share - diluted (in USD per share)	$ (0.21)	$ 0.52
Basic (in shares)	3,502	3,499
Diluted (in shares)	3,502	3,541