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(Loss)/Earnings Per Share - Calculations of Net (Loss)/Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share And Equity [Abstract]                  
Net (loss)/income $ (58,631) $ (114,558) $ 11,660 $ (57,850) $ (173,188) $ (46,190) $ (91,015) $ (120,116) $ (182,678)
Basic weighted average common shares outstanding 41,334   41,068   41,333 41,004 41,137 39,465 36,133
Diluted weighted average common shares outstanding 41,334   41,068   41,333 41,004 41,137 39,465 36,133
Net loss per common share attributable to Mesa Air Group:                  
Basic $ (1.42)   $ 0.28   $ (4.19) $ (1.13) $ (2.21) $ (3.04) $ (5.06)
Diluted $ (1.42)   $ 0.28   $ (4.19) $ (1.13) $ (2.21) $ (3.04) $ (5.06)