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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 611,258	$ 657,159	$ 1,643,848	$ 1,757,135
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	116,951	108,199	326,134	304,577
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] \| Marina/Storage Locations [Member]
Disaggregation of Revenue [Line Items]
Revenue	78,390	69,700	226,276	211,724
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	$ 38,561	$ 38,499	$ 99,858	$ 92,853

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

MARINEMAX INC 10-Q