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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($) $ in Millions	Feb. 08, 2021	Feb. 01, 2021
Subsequent Event [Line Items]
Payroll Support Program Extension, amount granted		$ 48.6
Payroll Support Program Extension, amount received	$ 24.3

X

- Definition

Payroll Support Program Extension, amount granted.

+ References

No definition available.

+ Details

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

X

- Definition

Payroll Support Program Extension, amount received.

+ References

No definition available.

+ Details

Name:	mesa_PayrollSupportProgramExtensionAmountReceived
Namespace Prefix:	mesa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

No definition available.

+ Details

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

X

- Details

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