Represents the periodic fee payable per vessel for management fees.

No definition available.

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

- Definition

Represents charter hire commission percentage.

+ References

No definition available.

+ Details

Name:	lpg_RelatedPartyTransactionCharterHireCommissionPercentage
Namespace Prefix:	lpg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the commission payable to related party as a percentage of the contract price.

+ References

No definition available.

+ Details

Name:	lpg_RelatedPartyTransactionCommissionAsPercentageOfContractPrice
Namespace Prefix:	lpg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The initial term of agreement entered into with the related party by the entity.

+ References

No definition available.

+ Details

Name:	lpg_RelatedPartyTransactionInitialTermOfAgreement
Namespace Prefix:	lpg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period of written advance notice of termination after initial termination period.

+ References

No definition available.

+ Details

Name:	lpg_RelatedPartyTransactionPeriodOfWrittenAdvanceNoticeOfTerminationAfterInitialTerminationPeriod
Namespace Prefix:	lpg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount paid to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_PaymentForManagementFee
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of cash paid for commissions during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForCommissions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lpg_DorianHellasSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=lpg_VeryLargeGasCarrierMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=lpg_PressurizedGasCarrierMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Transactions with Related Parties (Predecessor) (Details) - Manager - USD ($)		4 Months Ended	9 Months Ended	12 Months Ended
	Jul. 26, 2013	Jul. 28, 2013	Mar. 31, 2014	Mar. 31, 2016	Mar. 31, 2015
Transactions with Related Parties
Fixed monthly management fee	$ 93,750
Management fees			$ 3,100,000	$ 0	$ 1,100,000
Predecessor
Transactions with Related Parties
Initial term of agreement entered into with the related party by the entity		12 months
Period of written advance notice of termination after initial termination period		2 months
Commission as a percentage of contract price		1.00%
Charter hire commissions, included in Voyage expenses-related party		$ 198,360
Management fees		$ 601,202
Predecessor \| VLGC vessels
Transactions with Related Parties
Charter hire commission (as a percent)		1.25%
Fixed monthly management fee		$ 40,000
Predecessor \| PGC vessels
Transactions with Related Parties
Charter hire commission (as a percent)		2.00%
Fixed monthly management fee		$ 32,000