Long-Term Debt (Details)	6 Months Ended
	Sep. 30, 2015 USD ($) item	Mar. 31, 2015 USD ($)
Presented as follows:
Current portion of long-term debt	$ 42,360,541	$ 15,677,553
Long-term debt-net of current portion	485,927,672	184,665,874
Total	528,288,213	200,343,427
Drawdowns	338,291,681
Fees financed	8,466,998
Royal Bank of Scotland plc (RBS)
Presented as follows:
Total	114,300,500	119,106,500
Tranche A
Presented as follows:
Total	39,100,000	40,800,000
Tranche B
Presented as follows:
Total	29,405,500	30,684,000
Tranche C
Presented as follows:
Total	45,795,000	47,622,500
2015 Debt Facility
Presented as follows:
Total	413,987,713	81,236,927
Drawdowns	338,300,000
Fees financed	4,800,000
Balance available to be drawn	$ 338,600,000
Number of tranches in which loan facility is divided | item	4
Commercial Financing
Presented as follows:
Total	$ 136,502,693	26,695,381
KEXIM Direct Financing
Presented as follows:
Total	111,368,423	21,890,212
KEXIM Guaranteed
Presented as follows:
Total	110,173,250	21,655,293
K-sure Insured
Presented as follows:
Total	$ 55,943,347	$ 10,996,041