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RECENT RESTAURANT EXPANSION AND OTHER DEVELOPMENTS - Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 28, 2020
Mar. 29, 2019
Mar. 28, 2020
Mar. 29, 2019
Business Acquisition [Line Items]        
Basic (in shares) 3,500 3,475 3,499 3,475
Diluted (in shares) 3,500 3,475 3,499 3,475
JB's on the Beach        
Business Acquisition [Line Items]        
Total revenues   $ 38,877   $ 82,021
Net income   $ (235)   $ (210)
Net income per share - basic (in USD per share)   $ (0.07)   $ (0.06)
Net income per share - diluted (in USD per share)   $ (0.07)   $ (0.06)
Basic (in shares)   3,475   3,475
Diluted (in shares)   3,475   3,475