Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2019	May 24, 2019	Sep. 30, 2018
Document and Entity Information
Entity Registrant Name	DORIAN LPG LTD.
Entity Central Index Key	0001596993
Document Type	10-K
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 281,969,698
Entity Common Stock, Shares Outstanding		55,167,708
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY