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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, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share And Equity [Abstract]
Net income	$ 13,249	$ 19,081	$ 2,372	$ 22,624	$ 32,330	$ 24,996
Basic weighted average common shares outstanding	34,699		23,282		34,607	23,279
Add: Incremental shares for:
Dilutive effect of warrants			98			97
Dilutive effect of restricted stock	263		190		434	154
Diluted weighted average common shares outstanding	34,962		23,570		35,041	23,530
Net income per common share attributable to Mesa Air Group:
Basic	$ 0.38		$ 0.10		$ 0.93	$ 1.07
Diluted	$ 0.38		$ 0.10		$ 0.92	$ 1.06

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