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Earnings/(Loss) Per Share - Calculations of Net (Loss)/Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share And Equity [Abstract]                
Net Income (Loss) $ 20,856 $ (58,631) $ (114,558) $ (19,908) $ 11,660 $ (57,850) $ (152,332) $ (66,097)
Basic weighted average common shares outstanding 41,439     41,217     41,368 41,075
Diluted weighted average common shares outstanding 41,683     41,217     41,368 41,075
Net loss per common share attributable to Mesa Air Group:                
Basic $ 0.5     $ (0.48)     $ (3.68) $ (1.61)
Diluted $ 0.5     $ (0.48)     $ (3.68) $ (1.61)