Debt Instrument, Liquidation Requirement, Interest Percentage

No definition available.

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Namespace Prefix:	algt_
Data Type:	xbrli:pureItemType
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Period Type:	instant

- Definition

Line of Credit Facility, Additional Borrowing Capacity

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number Of Aircraft, Finance Lease Obligation

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Amount of excess of preference in liquidation over convertible debt instrument's if-converted par or stated value of share.

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Period Type:	instant

- Definition

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

+ References

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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- 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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- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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- 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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- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

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- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- 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

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

The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

+ References

No definition available.

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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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Long-Term Debt - Narrative (Detail) $ in Millions	1 Months Ended					12 Months Ended
Long-Term Debt - Narrative (Detail) $ in Millions	Dec. 31, 2024 USD ($) Aircraft	Mar. 31, 2024 USD ($)	Sep. 30, 2022 USD ($)	Aug. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)	Dec. 31, 2024 USD ($) Aircraft	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2023 USD ($)	Feb. 28, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 75.0						$ 158.0
Line of Credit Facility, Additional Borrowing Capacity	$ 18.8					$ 18.8
Number Of Aircraft, Finance Lease Obligation \| Aircraft	23					23
Proceeds from Issuance of Unsecured Debt	$ 130.5
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 218.5						$ 22.0	$ 200.0
Extinguishment of Debt, Amount						$ 132.6
Proceeds from (Repayments of) Debt						$ 215.7
Debt Instrument, Term		12 years				12 years
Revolving Credit Facility \| MUFG Bank, Ltd
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				100.0
Revolving Credit Facility \| Landesbank Hessen-Thüringen Girozentrale
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Amount			$ 200.0
Revolving Credit Facility \| Credit Agricole Corporate and Investment Bank
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity											$ 100.0		$ 50.0
Revolving Credit Facility \| BNP Paribas And Jackson Square Aviation
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity												$ 412.1
Line of Credit, Current							$ 196.4
Senior Secured Revolving Loan Facility \| Barclays Bank PLC
Debt Instrument [Line Items]
Long-Term Line of Credit				$ 75.0
Line of credit facility, expiration period				57 months
Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Convertible, Liquidation Preference, Value				$ 300.0
Debt Instrument, Liquidation Requirement, Interest Percentage				0.020
Delayed-Draw Construction Loan \| Sunseeker Resort
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 350.0
Debt Instrument, Interest Rate, Stated Percentage					5.75%
Repayments of Lines of Credit	250.0
Line of Credit, Current	$ 100.0					$ 100.0
Debt Instrument, Periodic Payment, Principal					$ 26.0
Senior Secured Notes Due 2027 \| Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 550.0
Debt Instrument, Interest Rate, Stated Percentage				7.25%