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Document and Entity Information - shares
 9 Months Ended
Jun. 30, 2019
Jul. 26, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol HZO  
Entity Registrant Name MARINEMAX INC  
Entity Central Index Key 0001057060  
Current Fiscal Year End Date --09-30  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Common Stock, Shares Outstanding   27,350,901
Entity Shell Company false  
Entity File Number 1-14173  
Entity Tax Identification Number 593496957  
Entity Address, Address Line One 2600 McCormick Drive  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town Clearwater  
Entity Address, State or Province Florida  
Entity Address, Postal Zip Code 33759  
City Area Code 727  
Local Phone Number 531-1700