Consolidated Statements of Cash Flows (USD $)	9 Months Ended	12 Months Ended
Mar. 31, 2014	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 2,833,843	$ 25,260,782
Adjustments to reconcile net income to net cash provided by operating activities:
Impairment		1,431,818us-gaap_AssetImpairmentCharges
Depreciation and amortization	6,620,372	14,093,744
Amortization of financing costs	800,806us-gaap_AmortizationOfFinancingCosts	830,899us-gaap_AmortizationOfFinancingCosts
Unrealized gain on derivatives	(2,623,456)us-gaap_UnrealizedGainLossOnDerivatives	(1,331,954)us-gaap_UnrealizedGainLossOnDerivatives
Stock-based compensation expense		2,311,565us-gaap_ShareBasedCompensation
Unrealized exchange differences	(8,004)	1,244,394
Other non-cash items		489,039us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities
Trade receivables, net and accrued revenue	(1,966,746)	(21,018,670)
Prepaid expenses and other receivables	(343,047)	(1,437,501)
Due from related parties	(1,639,497)	1,252,754
Inventories	396,776us-gaap_IncreaseDecreaseInInventories	(2,317,430)us-gaap_IncreaseDecreaseInInventories
Other non-current assets		(97,446)
Trade accounts payable	1,799,616	2,731,828
Accrued expenses and other liabilities	2,043,523	2,306,631
Due to related parties	(292,687)	411,705
Payments for drydocking costs	(385,077)	(538,938)
Net cash provided by operating activities	7,236,422	25,623,220
Cash flows from investing activities:
Payments for vessels and vessels under construction	(172,237,529)	(314,173,298)
Net payments to acquire predecessor businesses	(13,732,896)
Restricted cash deposits	(35,448,702)us-gaap_IncreaseInRestrictedCash	(28,700,000)us-gaap_IncreaseInRestrictedCash
Restricted cash released		30,938,702us-gaap_DecreaseInRestrictedCash
Payments to acquire other fixed assets	(15,597)	(392,248)
Net cash used in investing activities	(221,434,724)	(312,326,844)
Cash flows from financing activities:
Proceeds from long-term debt borrowings		80,086,143
Repayment of long-term debt borrowings	(6,506,000)us-gaap_RepaymentsOfLongTermDebt	(9,612,000)us-gaap_RepaymentsOfLongTermDebt
Financing costs paid	(1,516,847)us-gaap_PaymentsOfFinancingCosts	(11,220,812)us-gaap_PaymentsOfFinancingCosts
Cash proceeds from common shares issuances	510,496,990	155,830,178
Payments relating to issuance costs	(9,152,050)us-gaap_PaymentsOfStockIssuanceCosts	(1,388,918)us-gaap_PaymentsOfStockIssuanceCosts
Net cash provided by (used in) financing activities	493,322,093	213,694,591
Effects of exchange rates on cash and cash equivalents	8,004	(1,301,579)
Net (decrease)/increase in cash and cash equivalents	279,131,795	(74,310,612)
Cash and cash equivalents at the beginning of the period		279,131,795
Cash and cash equivalents at the end of the period	279,131,795	204,821,183
Supplemental disclosure of cash flow information
Cash paid during the period for interest including interest capitalized to vessels	1,242,500us-gaap_InterestPaid	2,552,893us-gaap_InterestPaid
Non cash consideration of shares issued to acquire Predecessor businesses and acquisitions of assets	187,495,680us-gaap_StockIssued1
Financing costs included in liabilities		1,039,479lpg_FinancingCostsIncurredButNotYetPaid
Issuance costs included in liabilities		$ 244,414lpg_IssuanceCostsIncurredButNotYetPaid

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