Revenue Recognition - Summary of Maintenance, Repair, Storage, Rental, Charter Services and Parts and Accessories Revenue for Retail Operations by Location Type (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 527,412	$ 631,515	$ 1,032,590	$ 1,099,976
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	107,693	97,709	208,008	199,234
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] \| Marina/Storage Locations [Member]
Disaggregation of Revenue [Line Items]
Revenue	75,577	71,012	147,886	142,024
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] \| Locations Without Marina/Storage [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 32,116	$ 26,697	$ 60,122	$ 57,210

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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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details