Transactions with Related Parties - Helios LPG Pool LLC (Details)		3 Months Ended		6 Months Ended
	Apr. 01, 2015 item	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) item	Sep. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Due to related parties		$ 17,397		$ 17,397		$ 168,793
Other income - related parties		680,950	$ 563,738	1,301,383	$ 1,155,540
Expense reimbursement income		371,292	185,476	$ 1,124,176	596,282
Helios LPG Pool LLC | MOL Energia
Related Party Transaction [Line Items]
Ownership interest (as a percent)	50.00%
Board members from each joint venture needed to approve operational activities | item	2
Total VLGC vessels operated by the Helios Pool | item				27
Dorian LPG owned VLGC vessels operated by the Helios Pool | item				23
MOL Energia owned VLGC vessels operated by the Helios Pool | item				4
Unrelated party time chartered-in VLGC vessels operated by the Helios Pool | item				4
Due from related parties		91,200,000		$ 91,200,000		93,700,000
Due to related parties		100,000		100,000		200,000
Working capital contributed		26,400,000		26,400,000		22,000,000.0
Working capital contributed, current		1,100,000		1,100,000		$ 1,100,000
Other income - related parties		600,000	500,000	1,200,000	1,100,000
Expense reimbursement income		$ 300,000	$ 100,000	$ 400,000	$ 500,000