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Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2024
Nov. 12, 2024
Mar. 31, 2024
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Document Period End Date Sep. 30, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol HZO    
Entity Registrant Name MarineMax, Inc.    
Entity Central Index Key 0001057060    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Security Exchange Name NYSE    
Title of 12(b) Security Common Stock, par value $.001 per share    
Entity Interactive Data Current Yes    
Entity File Number 1-14173    
Entity Incorporation, State or Country Code FL    
Entity Tax Identification Number 59-3496957    
Entity Address, Address Line One 501 Brooker Creek Boulevard    
Entity Address, City or Town Oldsmar    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 34677    
City Area Code 727    
Local Phone Number 531-1700    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Common Stock, Shares Outstanding   22,594,565  
Entity Public Float     $ 713,156,064
Documents Incorporated by Reference

Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement for the 2025 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.

    
Auditor Name KPMG LLP    
Auditor Firm ID 185    
Auditor Location Tampa, Florida    
Amendment Description This Amendment No. 1 to Annual Report on Form 10-K (this “Amendment”) amends our previously filed Annual Report on Form 10-K for the fiscal year ended September 30, 2024, filed with the Securities and Exchange Commission (“SEC”) on November 14, 2024 (the “Original Form 10-K”). This Amendment is being filed solely to include certain XBRL Interactive Data that was inadvertently omitted in the Original Form 10-K due to an administrative error. The omitted XBRL Interactive Data did not relate to any financial information included in the Original Form 10-K. This Amendment includes a disclosure in Item 10 of Part III that was included in the Original Form 10-K and a disclosure in Item 11 of Part III that was incorporated by reference into the Original Form 10-K from our Proxy Statement, filed with the SEC on January 3, 2025. Such disclosures are included in this Amendment solely to facilitate required tagging of XBRL Interactive Data and have not been amended, updated or restated herein. In connection with the filing of this Amendment and pursuant to Rule 12b-15 under the Securities and Exchange Act of 1934, as amended, we are including with this Amendment new certifications of our principal executive officer and principal financial officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Item 15 of Part IV has been amended to reflect the filing of these new certifications and to reflect the corrected XBRL Interactive Data. Except as expressly set forth above, this Amendment does not, and does not purport to, amend, update or restate the information contained in, or incorporated by reference into, the Original Form 10-K or reflect any events that have occurred after the filing of the Original Form 10-K.