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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, 2020	Dec. 31, 2019
Earnings Per Share And Equity [Abstract]
Net income	$ 14,118	$ 10,785
Basic weighted average common shares outstanding	35,531	35,023
Add: Incremental shares for:
Dilutive share adjustment - UST Warrant	800
Dilutive share adjustment - Restricted Shares	316	159
Diluted weighted average common shares outstanding	36,647	35,182
Net income per common share attributable to Mesa Air Group:
Basic	$ 0.40	$ 0.31
Diluted	$ 0.39	$ 0.31

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