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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2026	Sep. 28, 2025	Mar. 30, 2025	Jun. 29, 2025	Jul. 01, 2024
Business Combination [Line Items]
Impairment of intangible assets and goodwill	$ 38,640	$ 1,520,000	$ 0
Six Flags
Business Combination [Line Items]
Impairment of intangible assets and goodwill		1,340,000
Six Flags | Trade names
Business Combination [Line Items]
Impairment of intangible assets	37,100	169,300
Schlitterbahn | Trade names
Business Combination [Line Items]
Impairment of intangible assets	$ 1,600	$ 6,400
Former Six Flags
Business Combination [Line Items]
Indefinite-lived intangible assets acquired				$ 850,000	$ 850,000

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