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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						9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share And Equity [Abstract]
Net income	$ 3,419	$ 1,885	$ 10,785	$ 3,007	$ 13,249	$ 19,081	$ 16,089	$ 35,337
Basic weighted average common shares outstanding	35,299			34,835			35,154	34,683
Add: Incremental shares for:
Dilutive effect of restricted stock				277			94	368
Diluted weighted average common shares outstanding	35,299			35,112			35,248	35,051
Net income per common share attributable to Mesa Air Group:
Basic	$ 0.10			$ 0.09			$ 0.46	$ 1.02
Diluted	$ 0.10			$ 0.09			$ 0.46	$ 1.01

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