Document and Entity Information - shares	9 Months Ended
	Dec. 31, 2018	Jan. 25, 2019
Document and Entity Information
Entity Registrant Name	DORIAN LPG LTD.
Entity Central Index Key	0001596993
Document Type	10-Q
Document Period End Date	Dec. 31, 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		55,177,191
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3