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Earnings Per Share - Calculations of Net Income (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share And Equity [Abstract]    
Net income (loss) attributable to Mesa Air Group $ (14,274) $ 14,118
Basic weighted average common shares outstanding 35,963 35,531
Add: Incremental shares for:    
Dilutive effect of warrants   800
Dilutive effect of restricted stock   316
Diluted weighted average common shares outstanding 35,963 36,647
Net income (loss) per common share attributable to Mesa Air Group:    
Basic $ (0.40) $ 0.40
Diluted $ (0.40) $ 0.39