XML 86 R67.htm IDEA: XBRL DOCUMENT v3.21.2

Commitments and Contingencies - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Jul. 31, 2021 USD ($) Engine	Sep. 30, 2021 USD ($) Engine Lawsuit	Mar. 31, 2021 USD ($)	Feb. 28, 2021 USD ($)
Forward Purchase Contract [Member] | Heart Aerospace Incorporated [Member] | Maximum [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Purchase commitment amount	$ 1,200,000,000.0
CF34-8C5 or CF34-8E5 Engines [Member] | Letter Agreement No. 13-3 [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Number of new spare engines to be acquired | Engine	1	10
New spare engines delivery month and year description		The Company agreed to purchase and take delivery of ten (10) new CF34-8C5 or CF34-8E5 engines with delivery dates starting from July 1, 2021 through November 1, 2022. During the quarter ended March 31, 2021, a $7.0 million non-refundable purchase deposit was made for the first five engines to be delivered in calendar year 2021.
Purchase deposit			$ 7,000,000.0
Number of new spare engines to be delivered | Engine		5
Number of additional spare engines to be acquired beyond 2022 | Engine		10
Purchase commitment amount		$ 52,200,000
eVTOL Aircraft [Member] | Forward Purchase Contract [Member] | Archer Aviation, Inc. [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Purchase commitment amount				$ 200,000,000.0
IPO [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Number of putative class action lawsuits | Lawsuit		2
Superior Court of State of Arizona [Member] | IPO [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Number of putative class action lawsuits | Lawsuit		1
U.S. District Court of Arizona [Member] | IPO [Member]
Purchase Commitment Excluding Longterm Commitment [Line Items]
Number of putative class action lawsuits | Lawsuit		1

X

- Definition

New spare engines delivery month and year description.

+ References

No definition available.

+ Details

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

X

- Definition

Number of additional spare engines to be acquired.

+ References

No definition available.

+ Details

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

X

- Definition

Number of new spare engines to be acquired.

+ References

No definition available.

+ Details

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

X

- Definition

Number of new spare engines to be delivered.

+ References

No definition available.

+ Details

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

X

- Definition

Number of putative class action lawsuits.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount, at the balance sheet date, of deposits made to the manufacturer for new flight equipment still under construction. May include capitalized interest.

+ References

No definition available.

+ Details

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

X

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

Name:	us-gaap_PurchaseObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mesa_HeartAerospaceIncorporatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=mesa_CF348C5OrCF348E5EngineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_ProductOrServiceAxis=mesa_EVTOLAircraftMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mesa_ArcherAviationIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=mesa_SuperiorCourtOfTheStateOfArizonaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=mesa_USDistrictCourtOfArizonaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: