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Loss Per Share - Calculations of Net Loss Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share And Equity [Abstract]                
Net Income (Loss) $ (14,124) $ 20,855 $ (58,631) $ (24,917) $ (19,908) $ 11,660 $ (51,898) $ (33,165)
Basic weighted average common shares outstanding 41,873     41,322     41,551 41,203
Diluted weighted average common shares outstanding 41,873     41,322     41,551 41,203
Net loss per common share attributable to Mesa Air Group:                
Basic $ (0.34)     $ (0.6)     $ (1.25) $ (0.8)
Diluted $ (0.34)     $ (0.6)     $ (1.25) $ (0.8)