XML 133 R38.htm IDEA: XBRL DOCUMENT
v3.25.2

Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Various Classifications of Property and Equipment (Detail) | Sep. 30, 2024
--- | ---
Buildings [Member] |
Property Plant And Equipment [Line Items] |
Property and Equipment, Estimated Useful Life | 30 years
Aircraft [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Depreciation Method [Extensible Enumeration] | Useful Life, Lease Term [Member]
Flight Equipment [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property and Equipment, Estimated Useful Life | 7 years
Flight Equipment [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property and Equipment, Estimated Useful Life | 20 years
Equipment [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property and Equipment, Estimated Useful Life | 5 years
Equipment [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property and Equipment, Estimated Useful Life | 9 years
Furniture and Fixtures [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property and Equipment, Estimated Useful Life | 3 years
Furniture and Fixtures [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property and Equipment, Estimated Useful Life | 5 years
Vehicles [Member] |
Property Plant And Equipment [Line Items] |
Property and Equipment, Estimated Useful Life | 5 years
Rotable Spare Parts [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Depreciation Method [Extensible Enumeration] | Useful Life, Shorter of Lease Term or Asset Utility [Member]
Leasehold Improvements [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Depreciation Method [Extensible Enumeration] | Useful Life, Shorter of Lease Term or Asset Utility [Member]

X
- Definition Indicates method of allocating cost over useful life in systematic and rational manner for property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_PropertyPlantAndEquipmentDepreciationMethodExtensibleEnumeration
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mesa_AircraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FlightEquipmentMember
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: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mesa_RotableSparePartsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |