Significant Accounting Policies (Details 6) - Entity [Domain] - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Accrued Expenses and Other Payables
Accrued compensation and benefits	$ 104,044	$ 52,078
Excise and other tax liabilities	39,844	43,847
Derivative liabilities	27,321	27,950
Accrued interest	19,655	23,065
Product exchange liabilities	17,322	15,480
Other	29,221	32,696
Total	$ 237,407	$ 195,116