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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, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share And Equity [Abstract]
Net income	$ 1,885	$ 10,785	$ 13,249	$ 19,081	$ 12,670	$ 32,330
Basic weighted average common shares outstanding	35,141		34,699		35,082	34,607
Add: Incremental shares for:
Dilutive effect of restricted stock	124		263		138	434
Diluted weighted average common shares outstanding	35,265		34,962		35,220	35,041
Net income per common share attributable to Mesa Air Group:
Basic	$ 0.05		$ 0.38		$ 0.36	$ 0.93
Diluted	$ 0.05		$ 0.38		$ 0.36	$ 0.92

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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