Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2018	Jun. 26, 2018	Sep. 30, 2017
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, 2018
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			$ 213,530,640
Entity Common Stock, Shares Outstanding		55,228,723
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY