Fresh Start Accounting- 2024 Bankruptcy - Schedule of Changes to Retained Earnings (Details) - Fresh Start Adjustment $ in Thousands	Mar. 12, 2025 USD ($)
Reorganization, Chapter 11 [Line Items]
Valuation adjustment to the Company's assets due to the adoption of fresh start accounting	$ (171,459)
Valuation adjustment to the Company's debt and financing lease obligations due to the adoption of fresh start accounting	174,243
Impact of IBR change to right of use assets	(194,510)
Impact of IBR change to operating lease liabilities	189,549
Impact of deferred gain on sale leaseback write off	24,532
Impact to deferred tax balances	(16,852)
Elimination of accumulated other comprehensive income	127
Change in equity	$ 5,630

Adjustments To Retained Earnings, Deferred Tax Impacts

No definition available.

Name:	save_AdjustmentsToRetainedEarningsDeferredTaxImpacts
Namespace Prefix:	save_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Adjustments To Retained Earnings, Elimination Of Predecessor Accumulated Other Comprehensive Income

+ References

No definition available.

+ Details

Name:	save_AdjustmentsToRetainedEarningsEliminationOfPredecessorAccumulatedOtherComprehensiveIncome
Namespace Prefix:	save_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Adjustments To Retained Earnings, Impact Of Change To Operating Lease Liabilities

+ References

No definition available.

+ Details

Name:	save_AdjustmentsToRetainedEarningsImpactOfChangeToOperatingLeaseLiabilities
Namespace Prefix:	save_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Adjustments To Retained Earnings, Impact Of Change To Right-Of-Use Assets

+ References

No definition available.

+ Details

Name:	save_AdjustmentsToRetainedEarningsImpactOfChangeToRightOfUseAssets
Namespace Prefix:	save_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Adjustments To Retained Earnings, Impact Of Deferred Gain From Sale Leaseback Writeoff

+ References

No definition available.

+ Details

Name:	save_AdjustmentsToRetainedEarningsImpactOfDeferredGainFromSaleLeasebackWriteoff
Namespace Prefix:	save_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Adjustments To Retained Earnings, Valuation Adjustment Of Assets

+ References

No definition available.

+ Details

Name:	save_AdjustmentsToRetainedEarningsValuationAdjustmentOfAssets
Namespace Prefix:	save_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Adjustments To Retained Earnings, Valuation Adjustment Of Debt And Finance Lease Obligations

+ References

No definition available.

+ Details

Name:	save_AdjustmentsToRetainedEarningsValuationAdjustmentOfDebtAndFinanceLeaseObligations
Namespace Prefix:	save_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481435/852-10-45-14

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481404/852-10-50-7

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481404/852-10-50-7

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

+ Details

Name:	us-gaap_ReorganizationChapter11LineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) in stockholders' equity during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-11

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 205
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478009/946-205-45-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478448/946-505-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_StockholdersEquityPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=us-gaap_ReorganizationChapter11FreshStartAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: