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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
May 29, 2018
Sep. 30, 2017
Document Information [Line Items]      
Entity Registrant Name PETMED EXPRESS INC    
Entity Central Index Key 0001040130    
Trading Symbol pets    
Current Fiscal Year End Date --03-31    
Entity Filer Category Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Common Stock, Shares Outstanding (in shares)   20,600,605  
Entity Public Float     $ 655.1
Document Type 10-K    
Document Period End Date Mar. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false