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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
--- | --- | ---
Apr. 03, 2021 | Mar. 28, 2020 | Apr. 03, 2021 | Mar. 28, 2020
Business Acquisition [Line Items] |  |  |  |
Total revenues |  |  | $ 46,743 |
Net income |  |  | $ 3,433 |
Net income per share - basic (in dollars per share) |  |  | $ 0.98 |
Net income per share - diluted (in dollars per share) |  |  | $ 0.96 |
Basic (in shares) | 3,511 | 3,500 | 3,507 | 3,499
Diluted (in shares) | 3,627 | 3,500 | 3,579 | 3,499
Blue Moon Fish Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total revenues | $ 35,368 |  |  | $ 80,688
Net income | $ (1,542) |  |  | $ 315
Net income per share - basic (in dollars per share) | $ (0.44) |  |  | $ 0.09
Net income per share - diluted (in dollars per share) | $ (0.44) |  |  | $ 0.09
Basic (in shares) | 3,500 |  |  | 3,499
Diluted (in shares) | 3,500 |  |  | 3,538

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