Represents the amount of vessels under construction acquired at the acquisition date.

No definition available.

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Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents cost of coolant included in pre-delivery fees that are capitalized.

+ References

No definition available.

+ Details

Name:	lpg_CoolantCostIncludedInPreDeliveryFeeCapitalized
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of installment payments to shipyards.

+ References

No definition available.

+ Details

Name:	lpg_InstallmentPaymentsToShipyards
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the number of Very Large Gas Carrier vessels or newbuilding contracts acquired.

+ References

No definition available.

+ Details

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Namespace Prefix:	lpg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Very Large Gas Carrier vessels or newbuilding contracts executed pursuant to options exercised.

+ References

No definition available.

+ Details

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Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of pre-delivery fees that are capitalized.

+ References

No definition available.

+ Details

Name:	lpg_PreDeliveryFeeCapitalized
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the amount of water transportation structures or modifications to structures that have not been placed into service.

+ References

No definition available.

+ Details

Name:	lpg_VesselsUnderConstruction
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of reclassification, impairment, donation, or other change to long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lpg_DorianHellasSAMember
Namespace Prefix:
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Period Type:

Vessels Under Construction (Details) (USD $)	9 Months Ended	12 Months Ended	0 Months Ended
Vessels Under Construction (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2015 item	Jul. 29, 2013 item	Nov. 26, 2013 item
Vessels under construction
Balance		$ 323,206,206lpg_VesselsUnderConstruction
Capitalized interest	(972,010)us-gaap_InterestCostsCapitalized	(3,501,620)us-gaap_InterestCostsCapitalized
Balance	323,206,206lpg_VesselsUnderConstruction	398,175,504lpg_VesselsUnderConstruction
Number of VLGC vessels acquired		16
DHSA
Vessels under construction
Other capitalized expenditures	1,100,000
Vessels under commitment
Vessels under construction
Balance		323,206,206
Acquisition cost of vessel purchase options from Dorian Holdings and SeaDor exercised	7,134,126
Installment payments to shipyards	169,271,536	300,866,261
Other capitalized expenditures	1,839,689	11,016,951
Capitalized interest	972,010	3,501,620
Vessels delivered (transferred to Vessels)		(240,415,534)
Balance	323,206,206	398,175,504
LPG coolant cost included in Other capitalized expenditures		1,400,000
Vessels under commitment \| DHSA
Vessels under construction
Other capitalized expenditures	1,100,000	900,000
Vessels under commitment \| Third party vendors
Vessels under construction
Other capitalized expenditures	700,000	8,600,000
Vessels under commitment \| Employee related costs
Vessels under construction
Other capitalized expenditures		100,000
Vessels under commitment \| Dorian Holdings
Vessels under construction
Acquisition of new building contracts	17,593,130
Number of VLGC vessels acquired			2
Vessels under commitment \| SeaDor
Vessels under construction
Acquisition of new building contracts	7,009,675
Number of VLGC vessels acquired			1
Vessels under commitment \| Scorpio
Vessels under construction
Acquisition of new building contracts	$ 119,386,040
Number of VLGC vessels acquired				13