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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
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share And Equity [Abstract]    
Net loss $ (114,558) $ (57,850)
Basic weighted average common shares outstanding 41,332 40,940
Diluted weighted average common shares outstanding 41,332 40,940
Net loss per common share attributable to Mesa Air Group:    
Basic $ (2.77) $ (1.41)
Diluted $ (2.77) $ (1.41)