Debt Instrument, Basis Spread on Variable Rate Term

No definition available.

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Namespace Prefix:	algt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Number Of Tranches

+ References

No definition available.

+ Details

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Namespace Prefix:	algt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

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

- 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.

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+ Details

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Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
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Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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- Details

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- Details

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Period Type:

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Long-Term Debt - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
Long-Term Debt - Narrative (Details) $ in Millions	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) Aircraft	Jun. 30, 2025 USD ($) Aircraft	Dec. 31, 2024 USD ($)	Apr. 30, 2025 USD ($)	Feb. 28, 2025 USD ($)	Mar. 31, 2024 USD ($)	Nov. 30, 2023 USD ($)	Oct. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Delayed-Draw Construction Loan \| Sunseeker Resorts
Debt Instrument [Line Items]
Debt instrument, face amount									$ 350.0
Repayments of lines of credit				$ 250.0
Line of Credit, Current						$ 100.0
Financing Agreement
Debt Instrument [Line Items]
Debt instrument, term			12 years
Debt Instrument, Basis Spread on Variable Rate Term		3 months	3 months
Debt instrument, face amount		$ 149.2	$ 149.2
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 218.5			$ 100.0
Long-term line of credit		218.5	$ 218.5
Debt instrument, term			12 years
Line of Credit Facility, Remaining Borrowing Capacity		275.0	$ 275.0
Debt Instrument, Unused Borrowing Capacity, Amount		335.0	335.0
Revolving Credit Facility \| Other Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 158.0
Repayments of lines of credit			78.8
Line of Credit, Current		53.9	53.9
Debt Instrument, Unused Borrowing Capacity, Amount		25.1	25.1
Unsecured Credit Facility
Debt Instrument [Line Items]
Repayments of lines of credit		130.5
Proceeds from Issuance of Unsecured Debt	$ 130.5
Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 221.3
Line of Credit Facility, Remaining Borrowing Capacity		$ 166.0	$ 166.0
Debt Instrument, Basis Spread on Variable Rate Term		3 months	3 months
Debt Instrument, Number Of Tranches \| Aircraft		2	2
Repayments of lines of credit		$ 55.3
Secured Debt \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, term		7 years
Secured Debt \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, term		12 years