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
	Dec. 31, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 505,178	$ 468,461
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	99,369	100,695
Retail Operations [Member] \| Maintenance, Repair, Storage, Rental, Charter Services, Parts and Accessories Revenue [Member] \| Marina/Storage Locations [Member]
Disaggregation of Revenue [Line Items]
Revenue	72,309	71,012
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	$ 27,060	$ 29,683

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