Voyage Expenses (Details) (USD $)	9 Months Ended	12 Months Ended
Mar. 31, 2014	Mar. 31, 2015
Voyage Expenses.
Bunkers	$ 5,271,126lpg_BunkerExpenses	$ 15,678,905lpg_BunkerExpenses
Port charges and other related expenses	552,634lpg_PortChargesAndOtherRelatedExpenses	3,603,707lpg_PortChargesAndOtherRelatedExpenses
Brokers' commissions	386,244lpg_BrokersCommissionExpense	1,703,589lpg_BrokersCommissionExpense
Security cost	298,820lpg_SecurityCostExpenses	709,035lpg_SecurityCostExpenses
War risk insurances	37,001lpg_WarRiskInsurancesExpense	146,320lpg_WarRiskInsurancesExpense
Other voyage expenses	125,146lpg_OtherVoyageExpenses	240,300lpg_OtherVoyageExpenses
Total voyage expenses	$ 6,670,971lpg_VoyageExpenses	$ 22,081,856lpg_VoyageExpenses

Represents the amount of expenses incurred for broker commissions.

No definition available.

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

Represents the amount of expenses incurred for bunkers.

No definition available.

Represents the amount of voyage expenses other than bunkers, port charges, broker commissions, security cost, war risk insurance and other charges.

No definition available.

Represents the amount of expenses incurred for port charges and other related expenses.

No definition available.

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

Represents the amount of expenses incurred for security.

No definition available.

Represents the amount of voyage expenses incurred during the reported period.

No definition available.

Name:	lpg_VoyageExpensesAbstract
Namespace Prefix:	lpg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the amount of expenses incurred for war risk insurances.

No definition available.

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