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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 28, 2026	Mar. 29, 2026	Sep. 28, 2025	Jun. 29, 2025	Jun. 28, 2026	Jun. 29, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on disposal group	$ (9,867)			$ 0	$ (37,838)	$ 0
Loss on impairment of goodwill and other intangibles	$ 0			$ 0	38,640	$ 0
Six Flags \| Trade names
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets		$ 37,100	$ 169,300
Schlitterbahn \| Trade names
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets		$ 1,600	6,400
Six Flags And Schlitterbahn \| Indefinite-Lived Intangible Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on impairment of goodwill and other intangibles			$ 1,520,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Seven Parks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on disposal group					$ 37,800