Income Taxes (Details)	3 Months Ended		6 Months Ended						6 Months Ended		3 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2014 EUR (€)	Sep. 09, 2011 EUR (€)	Nov. 15, 2005 EUR (€)	Sep. 30, 2014 Effective Income Tax Rate Reconciliation excluding European Commission fine [Member]	Sep. 30, 2013 Effective Income Tax Rate Reconciliation excluding European Commission fine [Member]	Jun. 30, 2014 Deltafina [Member] USD ($)
Income Tax Disclosure [Line Items]
Federal statutory income tax rate			35.00%	35.00%
Effective income tax rate			24.00%	29.00%					10.00%	33.00%
Consolidated income tax expense (benefit)	$ 4,960,000	$ 12,139,000	$ (7,078,000)	$ 41,178,000							$ 8,000,000
Fines imposed by European Commission					$ 53,000,000	€ 38,900,000	€ 30,000,000	€ 30,000,000			$ 30,000,000