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Loss Per Share - Calculations of Net Loss Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share And Equity [Abstract]      
Net Income (Loss) $ (91,015) $ (120,116) $ (182,678)
Basic weighted average common shares outstanding 41,137 39,465 36,133
Diluted weighted average common shares outstanding 41,137 39,465 36,133
Net loss per common share attributable to Mesa Air Group:      
Basic $ (2.21) $ (3.04) $ (5.06)
Diluted $ (2.21) $ (3.04) $ (5.06)