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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
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share And Equity [Abstract]
Net income	$ 10,785	$ 19,081
Basic weighted average common shares outstanding	35,023	34,518
Add: Incremental shares for:
Dilutive effect of restricted stock	159	595
Diluted weighted average common shares outstanding	35,182	35,113
Net income per common share attributable to Mesa Air Group:
Basic	$ 0.31	$ 0.55
Diluted	$ 0.31	$ 0.54

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