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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 9 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Business Acquisition [Line Items]        
Basic (in shares) 3,502 3,481 3,500 3,477
Diluted (in shares) 3,502 3,530 3,500 3,531
JB's on the Beach        
Business Acquisition [Line Items]        
Total revenues   $ 46,423   $ 128,445
Net income   $ 4,123   $ 3,891
Net income per share - basic (in USD per share)   $ 1.18   $ 1.12
Net income per share - diluted (in USD per share)   $ 1.17   $ 1.10
Basic (in shares)   3,481   3,477
Diluted (in shares)   3,530   3,531