Vessel Operating Expenses (Details) (USD $)	9 Months Ended	12 Months Ended
Mar. 31, 2014	Mar. 31, 2015
Vessel Operating Expenses.
Crew wages and related costs	$ 5,306,441us-gaap_SalariesAndWages	$ 14,529,018us-gaap_SalariesAndWages
Spares and stores	1,395,287lpg_CostOfSparesAndStores	2,666,100lpg_CostOfSparesAndStores
Insurance	566,021lpg_CostOfInsurance	1,343,071lpg_CostOfInsurance
Repairs and maintenance costs	502,424	1,315,028
Lubricants	480,279lpg_CostOfLubricants	964,951lpg_CostOfLubricants
Miscellaneous expenses	144,507us-gaap_OtherCostAndExpenseOperating	437,997us-gaap_OtherCostAndExpenseOperating
Total	$ 8,394,959lpg_VesselOperatingExpenses	$ 21,256,165lpg_VesselOperatingExpenses

Represents the amount of expenses incurred on insurance.

No definition available.

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

- Definition

Represents the amount of expenses incurred on lubricants.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of expenses incurred on spares and stores.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of vessel operating expenses incurred during the reported period.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

+ References

+ Details

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

- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 5

+ Details

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

- Definition

Expenditures for salaries other than officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

+ References

+ Details

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