v3.24.1.u1
EARNINGS (LOSS) PER SHARE - Schedule of Basic and Diluted (Loss) Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 26, 2023
Earnings Per Share [Abstract]    
Net income (loss) $ 5,344 $ (1,273)
Net income (loss) attributable to non-controlling interests 782 (759)
NET INCOME (LOSS) ATTRIBUTABLE TO PORTILLO'S INC. $ 4,562 $ (514)
Shares:    
Weighted-average number of common shares outstanding-basic (in shares) 57,437,782 49,599,074
Dilutive share awards (in shares) 3,056,000 0
Weighted-average number of common shares outstanding-diluted (in shares) 60,493,958 49,599,074
Basic net income (loss) per share (in usd per share) $ 0.08 $ (0.01)
Diluted net income (loss) per share (in usd per share) $ 0.08 $ (0.01)