XML 95 R70.htm IDEA: XBRL DOCUMENT v3.25.2

Subsequent Events - Additional Information (Detail)											1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 04, 2025 USD ($) ENGINE	Apr. 03, 2025 USD ($)	Apr. 03, 2025 ENGINE	Apr. 03, 2025 AIRCRAFT	Apr. 03, 2025 AIRFRAMES	Mar. 18, 2025	Dec. 31, 2024 USD ($) AIRCRAFT	Dec. 24, 2024 USD ($) AIRFRAMES	Dec. 23, 2024 USD ($)	Oct. 01, 2024 USD ($) AIRFRAMES AIRCRAFT	Dec. 31, 2015 USD ($)	Mar. 31, 2025 USD ($) AIRFRAMES AIRCRAFT	Sep. 30, 2024 USD ($) ENGINE	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 30, 2024 USD ($)
Subsequent Event [Line Items]
Number of engines to be sold | ENGINE													55
Impairment loss												$ 12,400,000	$ 73,700,000	$ 50,600,000	$ 62,100,000
Engines Held For Sale [Member]
Subsequent Event [Line Items]
Impairment loss												$ 33,800
E-175 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft sold | AIRCRAFT												18
Remaining balance											$ 73,400,000
C R J 900 Airframes [Member]
Subsequent Event [Line Items]
Number of aircraft classified as assets held for sale | AIRFRAMES												3
CRJ-700 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft sold | AIRCRAFT										2
CF34-8C Engines [Member]
Subsequent Event [Line Items]
Number of aircraft classified as assets held for sale | AIRCRAFT												4
UST Loan [Member] | Minimum [Member]
Subsequent Event [Line Items]
Minimum collateral coverage ratio						0.91			0.99
Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of increase in CPA block hour rates	3.00%
Number of engines to be sold | ENGINE			23
Remaining balance										$ 73,400,000
Subsequent Event [Member] | United Capacity Purchase Agreement [Member] | United Airlines Inc [Member]
Subsequent Event [Line Items]
Common stock issued equivalent percentage of issued and outstanding capital stock	6.00%
Subsequent Event [Member] | Engines Held For Sale [Member]
Subsequent Event [Line Items]
Impairment Loss Held For Sale		$ 14,700,000								$ 25,400,000
Subsequent Event [Member] | United Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Loan balance forgiven																$ 4,500,000
Subsequent Event [Member] | E-175 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft sold | AIRCRAFT										2
Subsequent Event [Member] | E-175 Aircraft [Member] | Aircraft Purchase Agreement [Member]
Subsequent Event [Line Items]
Expected gross proceeds from sale of asset							$ 227,700,000
Expected proceeds from sale of asset							$ 84,700,000
Number of aircraft classified as assets held for sale | AIRCRAFT										18
Number of aircraft sold | AIRCRAFT							18
Subsequent Event [Member] | E-175 Aircraft [Member] | United Aircraft Purchase Agreement [Member]
Subsequent Event [Line Items]
Expected gross proceeds from sale of asset										$ 84,700,000			$ 227,700,000
Expected proceeds from sale of asset		16,300,000
Number of aircraft classified as assets held for sale | AIRCRAFT							18			18
Gross proceeds from sale of asset										$ 120,600,000
Number of aircraft sold | AIRCRAFT				23
Subsequent Event [Member] | C R J 900 Airframes [Member] | Aircraft Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of aircraft sold | AIRFRAMES										4
Subsequent Event [Member] | C R J 900 Airframes [Member] | Airframe Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of aircraft classified as assets held for sale | AIRFRAMES								29
Gross proceeds from sale of asset		9,100,000							$ 19,000,000
Number of aircraft sold			14		14			15
Impairment loss								$ 6,700,000
Subsequent Event [Member] | CRJ-700 Aircraft [Member]
Subsequent Event [Line Items]
Gross proceeds from sale of asset										$ 11,000,000
Net proceeds from sale of asset										$ 6,800,000
Subsequent Event [Member] | CF34-8C Engines [Member] | Airframe Purchase Agreement [Member]
Subsequent Event [Line Items]
Number of aircraft sold | AIRFRAMES										18
Subsequent Event [Member] | C F34 8CEngine [Member] | United Aircraft Purchase Agreement [Member]
Subsequent Event [Line Items]
Expected proceeds from sale of asset		16,300,000
Number of aircraft sold | ENGINE			23
Subsequent Event [Member] | UST Loan [Member]
Subsequent Event [Line Items]
Gross proceeds from sale of asset	$ 5,000,000
Minimum collateral coverage ratio									1.55
Number of engine sold | ENGINE	5
Subsequent Event [Member] | UST Loan [Member] | Minimum [Member]
Subsequent Event [Line Items]
Minimum collateral coverage ratio						0.91			0.99
Subsequent Event [Member] | UST Loan [Member] | Aircraft Purchase Agreement [Member]
Subsequent Event [Line Items]
Gross proceeds from sale of asset										$ 22,400,000
Repayments of debt										$ 21,000,000
Subsequent Event [Member] | UST Loan [Member] | C R J 900 Airframes [Member] | Airframe Purchase Agreement [Member]
Subsequent Event [Line Items]
Gross proceeds from sale of asset		$ 28,100,000

X

- Definition

Common stock issued equivalent percentage of issued and outstanding capital stock.

+ References

No definition available.

+ Details

Name:	mesa_CommonStockIssuedEquivalentPercentageOfIssuedAndOutstandingCapitalStock
Namespace Prefix:	mesa_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expected gross proceeds from sale of productive assets.

+ References

No definition available.

+ Details

Name:	mesa_ExpectedGrossProceedsFromSaleOfProductiveAssets
Namespace Prefix:	mesa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Expected proceeds from sale of productive assets.

+ References

No definition available.

+ Details

Name:	mesa_ExpectedProceedsFromSaleOfProductiveAssets
Namespace Prefix:	mesa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Gross Proceeds From Sale Of Productive Assets

+ References

No definition available.

+ Details

Name:	mesa_GrossProceedsFromSaleOfProductiveAssets
Namespace Prefix:	mesa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Impairment loss held for sale.

+ References

No definition available.

+ Details

Name:	mesa_ImpairmentLossHeldForSale
Namespace Prefix:	mesa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Loan balance forgiven.

+ References

No definition available.

+ Details

Name:	mesa_LoanBalanceForgiven
Namespace Prefix:	mesa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum collateral coverage ratio 1.

+ References

No definition available.

+ Details

Name:	mesa_MinimumCollateralCoverageRatio1
Namespace Prefix:	mesa_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of aircraft classified as assets held for sale.

+ References

No definition available.

+ Details

Name:	mesa_NumberOfAircraftClassifiedAsAssetsHeldForSale
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

Percentage of increase in CPA block hour rates.

+ References

No definition available.

+ Details

Name:	mesa_PercentageOfIncreaseInCPABlockHourRates
Namespace Prefix:	mesa_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Remaining balance

+ References

No definition available.

+ Details

Name:	mesa_RemainingBalance
Namespace Prefix:	mesa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482130/360-10-45-15

+ Details

Name:	us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

+ Details

Name:	us-gaap_ProceedsFromSaleOfProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

+ Details

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

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=mesa_EnginesHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_E175AircraftMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_CRJ900AirframesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_CRJ700AircraftMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_CF34-8CEnginesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=mesa_UstLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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:	us-gaap_FinancialInstrumentAxis=mesa_UnitedCapacityPurchaseAgreementMember
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:	us-gaap_CreditFacilityAxis=mesa_UnitedRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=mesa_AircraftPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=mesa_UnitedAircraftPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=mesa_AirframePurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_AircraftTypeAxis=mesa_CF348CengineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: