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Earnings Per Share - Calculations of Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share And Equity [Abstract]
Net income	$ 19,081	$ 22,624
Basic weighted average common shares outstanding	23,903	11,294
Add: Incremental shares for:
Dilutive effect of warrants	10,609	12,076
Dilutive effect of restricted stock	309	189
Diluted weighted average common shares outstanding	34,821	23,559
Net income per common share attributable to Mesa Air Group:
Basic	$ 0.80	$ 2.00
Diluted	$ 0.55	$ 0.96

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