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Subsequent Events - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2023
Subsequent Event [Line Items]
Amended and restated bylaws descriptions	Pursuant to Section 3.15 of the Bylaws of the Company, United has the right to designate one person to be a member of both the Company's Board and the Board of Directors of Mesa Airlines, subject to the reasonable approval of the Board.

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- Definition

Amended and restated bylaws descriptions.

+ References

No definition available.

+ Details

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Namespace Prefix:	mesa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration