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Goodwill Other Intangible Assets and Other Long Term Assets - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed at Acquisition Date (Parenthetical) (Detail) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Oct. 01, 2022	May 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Cash purchase price and net working capital adjustments, net of cash acquired			$ 516,794	$ 83,198	$ 134,205
IGY Marinas [Member]
Business Acquisition [Line Items]
Current assets and net working capital, net of cash acquired	$ 28,075
Cash purchase price and net working capital adjustments, net of cash acquired	$ 28,075
Cruisers Yachts [Member]
Business Acquisition [Line Items]
Current assets and net working capital, net of cash acquired		$ 5,993
Cash purchase price and net working capital adjustments, net of cash acquired		$ 5,993

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- 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.

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-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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-Section 50
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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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