Document and Entity Information - shares	6 Months Ended
	Sep. 30, 2017	Nov. 01, 2017
Document and Entity Information
Entity Registrant Name	DORIAN LPG LTD.
Entity Central Index Key	0001596993
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
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		55,115,380
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2