XML 41 R30.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Special Charges - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 Aircraft | Mar. 31, 2024 USD ($) Aircraft | Dec. 31, 2023 Aircraft
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Number of aircraft retired | Aircraft | 21 | 2 | 2
Hurricane Ian |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Unusual or infrequent item, or both, loss, gross |  | $ 78.2 |
Unusual or infrequent item, or both, insurance proceeds |  | $ 52.5 |

X
- Definition Number Of Aircraft Retired + References No definition available. + Details
Name: | algt_NumberOfAircraftRetired
Namespace Prefix: | algt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483613/220-20-50-1 + Details
Name: | us-gaap_UnusualOrInfrequentItemInsuranceProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_UnusualOrInfrequentItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before deduction of insurance proceeds, of loss recognized in the income statement for an event or transaction that is unusual in nature or infrequent in occurrence, or both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483613/220-20-50-1 + Details
Name: | us-gaap_UnusualOrInfrequentItemLossGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_UnusualRiskOrUncertaintyByNatureAxis=algt_HurricaneIanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |