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Earnings Per Share and Equity - Calculations of Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share And Equity [Abstract]
Net income	$ 3,007	$ 13,249	$ 19,081	$ (11,135)	$ 2,372	$ 22,624	$ 35,337	$ 13,861
Basic weighted average common shares outstanding	34,835,000			23,336,000			34,683,000	23,298,000
Add: Incremental shares for:
Dilutive effect of warrants				0				140,000
Dilutive effect of restricted stock	277,000						368,000	334,000
Diluted weighted average common shares outstanding	35,112,000			23,336,000			35,051,000	23,772,000
Net income per common share attributable to Mesa Air Group:
Basic	$ 0.09			$ (0.48)			$ 1.02	$ 0.59
Diluted	$ 0.09			$ (0.48)			$ 1.01	$ 0.58

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