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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 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share And Equity [Abstract]          
Net Income (Loss) $ (111,944) $ (57,850) $ (91,015) $ (120,116) $ (182,678)
Basic weighted average common shares outstanding 41,332 40,940 41,137 39,465 36,133
Diluted weighted average common shares outstanding 41,332 40,940 41,137 39,465 36,133
Net loss per common share attributable to Mesa Air Group:          
Basic $ (2.71) $ (1.41) $ (2.21) $ (3.04) $ (5.06)
Diluted $ (2.71) $ (1.41) $ (2.21) $ (3.04) $ (5.06)