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Earnings Per Share - Calculations of Net Income/(Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share And Equity [Abstract]                
Net loss $ (19,908) $ 11,660 $ (57,850) $ (47,560) $ (35,122) $ (9,090) $ (66,097) $ (91,771)
Basic weighted average common shares outstanding 41,217     40,688     41,075 38,986
Diluted weighted average common shares outstanding 41,217     40,688     41,075 38,986
Net loss per common share attributable to Mesa Air Group:                
Basic $ (0.48)     $ (1.17)     $ (1.61) $ (2.35)
Diluted $ (0.48)     $ (1.17)     $ (1.61) $ (2.35)