Document and Entity Information - shares	3 Months Ended
	Jun. 30, 2018	Aug. 07, 2018
Document and Entity Information
Entity Registrant Name	DORIAN LPG LTD.
Entity Central Index Key	0001596993
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		55,157,193
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1