Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Fair value portion of notes payable.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair Value Measurements (Details) - USD ($)	3 Months Ended
Fair Value Measurements (Details) - USD ($)	Dec. 31, 2017	Sep. 25, 2016	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt issuance costs	$ 24,485,000		$ 21,807,000
Carrying Value \| Other Current Assets \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments	736,000		511,000
Carrying Value \| Derivative Liability \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	(8,722,000)		(6,705,000)
Carrying Value \| April 2017 term debt \| Long-Term Debt \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of term debt	(735,000,000)		(729,375,000)
Carrying Value \| April 2017 notes \| Long-Term Debt \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(500,000,000)		(500,000,000)
Carrying Value \| June 2014 notes \| Long-Term Debt \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(450,000,000)		(450,000,000)
Fair Value \| Other Current Assets \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term investments	736,000		511,000
Fair Value \| Derivative Liability \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	(8,722,000)		(6,705,000)
Fair Value \| April 2017 term debt \| Long-Term Debt \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of term debt	(742,350,000)		(707,494,000)
Fair Value \| April 2017 notes \| Long-Term Debt \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(525,000,000)		(475,000,000)
Fair Value \| June 2014 notes \| Long-Term Debt \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	(469,125,000)		$ (441,000,000)
Wildwater Kingdom [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets held-for-use	$ 7,600,000	$ 0