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Earnings Per Share and Equity - Calculations of Net Income Per Common Share Attributable to Mesa Air Group (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Line Items]
Net income attributable to Mesa Air Group	$ (11,135)	$ 15,433	$ 13,861	$ 27,347
Basic weighted average common shares outstanding	12,462,000	10,993,000	11,782,000	10,852,000
Add: Incremental shares for:
Dilutive effect of warrants	0	12,230,000	11,702,000	12,389,000
Dilutive effect of restricted stock			568,000
Diluted weighted average common shares outstanding	12,462,000	23,223,000	24,052,000	23,241,000
Net income per common share attributable to Mesa Air Group:
Basic	$ (0.89)	$ 1.40	$ 1.18	$ 2.52
Diluted	$ (0.89)	$ 0.66	$ 0.58	$ 1.18

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