| Document and Entity Information | Jul. 01, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 1, 2020 |
| Entity Registrant Name | MarineMax, Inc. |
| Entity Central Index Key | 0001057060 |
| Entity Emerging Growth Company | false |
| Entity File Number | 1-14173 |
| Entity Incorporation State Country Code | FL |
| Entity Tax Identification Number | 59-3496957 |
| Entity Address Address Line1 | 2600 McCormick Drive |
| Entity Address, Address Line Two | Suite 200 |
| Entity Address City Or Town | Clearwater |
| Entity Address State Or Province | FL |
| Entity Address Postal Zip Code | 33759 |
| City Area Code | 727 |
| Local Phone Number | 531-1700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $.001 per share |
| Trading Symbol | HZO |
| Security Exchange Name | NYSE |
