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Earnings Per Share and Equity - Calculations of Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share And Equity [Abstract]            
Net income $ 5,689 $ 14,118 $ 1,885 $ 10,785 $ 19,807 $ 12,670
Basic weighted average common shares outstanding 35,628   35,141   35,579 35,082
Add: Incremental shares for:            
Dilutive share adjustment - UST Warrant 3,038       2,183 138
Dilutive share adjustment - Restricted Shares 766   124   620  
Diluted weighted average common shares outstanding 39,432   35,265   38,382 35,220
Net income per common share attributable to Mesa Air Group:            
Basic $ 0.16   $ 0.05   $ 0.56 $ 0.36
Diluted $ 0.14   $ 0.05   $ 0.52 $ 0.36