Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	May 28, 2019	Sep. 30, 2018
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 Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding (in shares)		20,223,354
Entity Public Float			$ 656
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false