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GOODWILL AND INTANGIBLE ASSETS, NET - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 06, 2025 | Apr. 13, 2025 | Jul. 07, 2024 | Jul. 06, 2025 | Jul. 07, 2024
Goodwill [Line Items] |  |  |  |  |
Impairment of goodwill |  |  |  | $ 31,656 |
Acquisition of Del Taco company-operated restaurants |  |  |  | 6,326 |
Operating restaurant impairment charges | $ 1,058 |  | $ 136 | 2,935 | $ 136
Del Taco |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquisition of Del Taco company-operated restaurants | 6,326 |  | 0 | 6,326 | $ 0
Trade Names |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Operating restaurant impairment charges |  | $ 177,900 |  | 177,900 |
Del Taco |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment of goodwill |  | $ 25,300 | 162,600 | 31,656 |
Acquisition of Del Taco company-operated restaurants | $ 6,300 |  |  | $ 6,326 |
Operating restaurant impairment charges |  |  | $ 2,200 |  |

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