XML 47 R40.htm IDEA: XBRL DOCUMENT v3.25.1

Assets Held for Sale - Additional Information (Detail) $ in Thousands			1 Months Ended	3 Months Ended
	Apr. 03, 2025 Engine	Dec. 31, 2024 USD ($) Engine Airframes AirCraft	Sep. 30, 2024 USD ($) Airframes	Dec. 31, 2024 USD ($) Airframes AirCraft Engine
Long Lived Assets Held For Sale [Line Items]
Assets held for sale | $			$ 86,605
Aircraft held for sale current | $		$ 80,723	$ 5,741	$ 80,723
Current Assets [Member]
Long Lived Assets Held For Sale [Line Items]
Aircraft held for sale current | $		$ 80,700		$ 80,700
Subsequent Event [Member]
Long Lived Assets Held For Sale [Line Items]
Number of engines held to sale | Engine	23
CRJ-900 Airframes [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | Airframes				2
CRJ-700 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale				2
Number of aircraft sold				2
GE Model CF34-8C [Member]
Long Lived Assets Held For Sale [Line Items]
Number of engine sold | Engine				4
Airframes [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | Airframes		28	26
Engines [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale | Engine		51		55
United Airlines Inc [Member] | E-175 [Member]
Long Lived Assets Held For Sale [Line Items]
Number of aircraft held for sale		10		18
Number of aircraft sold				8

X

- Definition

Number of aircraft held for sale.

+ References

No definition available.

+ Details

Name:	mesa_NumberOfAircraftHeldForSale
Namespace Prefix:	mesa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of aircraft sold.

+ References

No definition available.

+ Details

Name:	mesa_NumberOfAircraftSold
Namespace Prefix:	mesa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of engine sold.

+ References

No definition available.

+ Details

Name:	mesa_NumberOfEngineSold
Namespace Prefix:	mesa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of engines to be sold.

+ References

No definition available.

+ Details

Name:	mesa_NumberOfEnginesToBeSold
Namespace Prefix:	mesa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482309/360-10-15-4

+ Details

Name:	us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482309/360-10-15-4

+ Details

Name:	us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=mesa_CurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_CRJ-900AirframesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=srt_CRJ700Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_GEModelCF34-8CMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_AirframesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_EnginesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=mesa_UnitedAirlinesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_E-175Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: