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Description of the Business and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 29, 2026
Accounting Policies [Abstract]
Contingencies	Contingencies The Company is a party to a number of lawsuits in the normal course of business. In the opinion of management, none of these matters, beyond what has been disclosed in this Quarterly Report on Form 10-Q, are expected to have a material effect in the aggregate on the unaudited consolidated financial statements.
Self-Insurance Reserves	Self-Insurance Reserves As disclosed in the Form 10-K filed by the Company on February 26, 2026, the Company records self-insurance reserves for the estimated amount of guest and employee claims and related expenses incurred each period. Reserves are established for both identified claims and incurred but not reported ("IBNR") claims and are recorded when claim amounts become probable and estimable.
New Accounting Pronouncements	New Accounting Pronouncements In November 2024, the FASB issued Accounting Standards Update No. 2024-03, Income Statement - Reporting Comprehensive Income (Subtopic 220-40): Expense Disaggregation Disclosures ("ASU 2024-03"). ASU 2024-03 requires additional information about specific expense categories in the notes to the financial statements. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026. Early adoption is permitted. The amendments should be applied either (1) prospectively to financial statements issued after the effective date or (2) retrospectively to all prior periods presented in the financial statements. Management is in the process of evaluating the effect this standard will have on the consolidated financial statement disclosures. In September 2025, the FASB issued Accounting Standards Update No. 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software ("ASU 2025-06"). ASU 2025-06 amends the threshold entities apply to begin capitalizing internal-use software costs, clarifies disclosure requirements related to internal-use software costs and supersedes existing website development costs guidance. ASU 2025-06 is effective for fiscal years beginning after December 15, 2027. Early adoption is permitted. The amendments may be applied using a prospective, retrospective or modified transition approach. Management is in the process of evaluating the effect this standard will have on the consolidated financial statements, but management expects the impact of the amendments to be immaterial.
Earnings per Share	For purposes of calculating the basic and diluted earnings per share of common stock, net loss attributable to Six Flags Entertainment Corporation for the three months ended March 29, 2026 and March 30, 2025 has not been adjusted from the reported amounts.

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Disclosure of accounting policy for commitments and contingencies, which may include policies for recognizing and measuring loss and gain contingencies.

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Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.

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