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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 9 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share And Equity [Abstract]                
Net income $ 4,276 $ 5,689 $ 14,118 $ 3,419 $ 1,885 $ 10,785 $ 24,083 $ 16,089
Basic weighted average common shares outstanding 35,769     35,299     35,642 35,154
Add: Incremental shares for:                
Dilutive share adjustment - UST warrant 3,084           2,536  
Dilutive share adjustment - restricted shares 660           633 94
Diluted weighted average common shares outstanding 39,513     35,299     38,811 35,248
Net income per common share attributable to Mesa Air Group:                
Basic $ 0.12     $ 0.10     $ 0.68 $ 0.46
Diluted $ 0.11     $ 0.10     $ 0.62 $ 0.46