Document and Entity Information - shares	3 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
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, 2020
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-36437
Entity Incorporation, State or Country Code	1T
Entity Tax Identification Number	66-0818228
Entity Address, Address Line One	27 Signal Road
Entity Address, City or Town	Stamford
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06902
City Area Code	203
Local Phone Number	674-9900
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	LPG
Security Exchange Name	NYSE
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		51,030,487
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1