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	9 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 657,159	$ 757,720	$ 1,757,135	$ 1,867,886
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	108,199	104,551	304,577	298,724
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] \| Marina/Storage Locations [Member]
Disaggregation of Revenue [Line Items]
Revenue	69,700	68,181	211,724	209,504
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	$ 38,499	$ 36,370	$ 92,853	$ 89,220

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.

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